Connection Error - Serialize Binary

[Nazarboy_Rakhmonov]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

serialize binary: invalid int 32: 4294967295 [internal]

Request ID: 2b3ca9ea-199d-433e-a49a-f37ca2960e5e

ConnectError: [internal] serialize binary: invalid int 32: 4294967295

at aou.$endAiConnectTransportReportError (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12706:475325)

at JXe._doInvokeHandler (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:23170)

at JXe._invokeHandler (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:22912)

at JXe._receiveRequest (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:21544)

at JXe._receiveOneMessage (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:20361)

at mMt.value (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:18388)

at Ce._deliver (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2962)

at Ce.fire (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:3283)

at Gyt.fire (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12691:12156)

at MessagePort. (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:15679:18406)

Steps to Reproduce

It is happening when the AI is trying to run something on Terminal.

Expected Behavior

I feel like the error is emerging when the AI is trying to run something on Terminal.

Screenshots / Screen Recordings

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.3.35 (user setup)
VSCode Version: 1.105.1
Commit: cf8353edc265f5e46b798bfb276861d0bf3bf120
Date: 2026-01-13T07:39:18.564Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Windows_NT x64 10.0.22631

For AI issues: which model did you use?

All of them, but none worked.

For AI issues: add Request ID with privacy disabled

serialize binary: invalid int 32: 4294967295 [internal]

Request ID: 2b3ca9ea-199d-433e-a49a-f37ca2960e5e
ConnectError: [internal] serialize binary: invalid int 32: 4294967295
at aou.$endAiConnectTransportReportError (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12706:475325)
at JXe._doInvokeHandler (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:23170)
at JXe._invokeHandler (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:22912)
at JXe._receiveRequest (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:21544)
at JXe._receiveOneMessage (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:20361)
at mMt.value (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:18388)
at Ce._deliver (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2962)
at Ce.fire (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:3283)
at Gyt.fire (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12691:12156)
at MessagePort. (vscode-file://vscode-app/d:/Apps/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:15679:18406)

Additional Information

Please I want Cursor to fix this.
I tried:

1. Run Network Diagnostics – no errors appeared there.
2. Change the terminal to Command Prompt, Git Bash, Ubuntu – none of them worked.
3. I reinstalled Cursor – it worked like 3prompts but then the same issue!
4. I was not using any VPN, Proxy.
5. The same error even if I changed models.

Does this stop you from using Cursor

Yes - Cursor is unusable

[deanrie]

Hey, thanks for the report.

Based on the invalid int 32: 4294967295 error, this looks like a PowerShell terminal bug on Windows. You mentioned you tried Command Prompt and Git Bash, but the issue still happens. That’s odd, since switching terminals usually fixes it.

Let’s try again, but more carefully:

1. Fully close Cursor
2. Open Settings (you can use the settings file too):
   • Press Ctrl+,
   • Search for terminal.integrated.defaultProfile.windows
   • Make sure it’s set to “Command Prompt” (not PowerShell)
3. Restart Cursor
4. Try a simple request in the agent (for example, ask it to print the current directory)

If that doesn’t help, I’ll need a bit more info:

• What exact command is the agent trying to run when the error happens?

I’ll pass this to the engineers to investigate.

[Ryan_Clifton (Cursor user)]

Experiencing this same issue on Windows. It’s in the agent window and is happening constantly now. Cursor basically unusable. I’ve restarted the whole computer, no change

Request ID: 5ff8f6b0-06b9-40ce-b6bb-5ef54a03178f
ConnectError: [internal] serialize binary: invalid int 32: 4294967295
at aou.$endAiConnectTransportReportError (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12706:475325)
at JXe._doInvokeHandler (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:23170)
at JXe._invokeHandler (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:22912)
at JXe._receiveRequest (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:21544)
at JXe._receiveOneMessage (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:20361)
at mMt.value (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:18388)
at Ce._deliver (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2962)
at Ce.fire (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:3283)
at Gyt.fire (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12691:12156)
at MessagePort. (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:15679:18406)

[Sergey_Volynets]

Same for me

[talatccan (Talat CAN)]

Request ID: 22719278-8330-4e5b-8570-bdbf9afb23e7
ConnectError: [internal] serialize binary: invalid int 32: 4294967295
at aou.$endAiConnectTransportReportError (vscode-file://vscode-app/c:/Users/talat/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12706:475325)
at JXe._doInvokeHandler (vscode-file://vscode-app/c:/Users/talat/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:23170)
at JXe._invokeHandler (vscode-file://vscode-app/c:/Users/talat/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:22912)
at JXe._receiveRequest (vscode-file://vscode-app/c:/Users/talat/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:21544)
at JXe._receiveOneMessage (vscode-file://vscode-app/c:/Users/talat/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:20361)
at mMt.value (vscode-file://vscode-app/c:/Users/talat/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:18388)
at Ce._deliver (vscode-file://vscode-app/c:/Users/talat/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2962)
at Ce.fire (vscode-file://vscode-app/c:/Users/talat/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:3283)
at Gyt.fire (vscode-file://vscode-app/c:/Users/talat/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12691:12156)
at MessagePort. (vscode-file://vscode-app/c:/Users/talat/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:15679:18406)

[Ewgenij]

Request ID: 98cbba31-8b33-4daa-a0d3-62d3acb188ea
ConnectError: [internal] serialize binary: invalid int 32: 4294967295
at dou.$endAiConnectTransportReportError (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12706:475325)
at JXe._doInvokeHandler (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:23170)
at JXe._invokeHandler (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:22912)
at JXe._receiveRequest (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:21544)
at JXe._receiveOneMessage (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:20361)
at pMt.value (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:18388)
at Ce._deliver (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2962)
at Ce.fire (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:3283)
at jyt.fire (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12691:12156)
at MessagePort. (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:15681:18406)

[Yair_Katznelson]

Same here, it is not possible to work with cursor!

Request ID: 86175bfb-e903-4d1a-a319-16817c552e0b
ConnectError: [internal] serialize binary: invalid int 32: 4294967295
at dou.$endAiConnectTransportReportError (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12706:475325)
at JXe._doInvokeHandler (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:23170)
at JXe._invokeHandler (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:22912)
at JXe._receiveRequest (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:21544)
at JXe._receiveOneMessage (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:20361)
at pMt.value (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:18388)
at Ce._deliver (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2962)
at Ce.fire (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:3283)
at jyt.fire (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12691:12156)
at MessagePort. (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:15681:18406)

[Zaborov_Mihail (Заборов Михаил)]

Request ID: af8369f5-0104-4a3a-aa97-e456ced56ac5
[internal] serialize binary: invalid int 32: 3221226505
LTe: [internal] serialize binary: invalid int 32: 3221226505
at kmf (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:38337)
at Cmf (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:37240)
at $mf (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:4395)
at ova.run (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:8170)
at async qyt.runAgentLoop (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34190:57047)
at async Wpc.streamFromAgentBackend (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34239:7695)
at async Wpc.getAgentStreamResponse (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34239:8436)
at async FTe.submitChatMaybeAbortCurrent (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9170:14575)
at async Oi (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:32991:3808)

cursor_support_ticket_terminal_issue_EN.txt (5,4 КБ)

[Zaborov_Mihail (Заборов Михаил)]

# Cursor Support Ticket - Terminal Issue (English)

**Topic:** Connection Error - Serialize Binary - #3 by deanrie

**Request ID:** `af8369f5-0104-4a3a-aa97-e456ced56ac5`

-–

## Problem Description

After the latest Cursor update, the integrated terminal in my project stopped executing **any** commands (PowerShell). Previously, clearing `%APPDATA%\Cursor\User\workspaceStorage\` helped temporarily, but now **it doesn’t help** — terminals break immediately after the update/launch.

In parallel, an **Internal Error** popup appears in the chat UI, and I see an error in the logs/stack:

`[internal] serialize binary: invalid int 32: 3221226505`

## Environment

- **OS**: Windows 10 (10.0.22631)

- **Shell**: PowerShell

- **Workspace**: `C:\Projects\PhotoSorter` (git repo)

- **Terminal**: integrated terminal in Cursor

- **Request ID**: `af8369f5-0104-4a3a-aa97-e456ced56ac5`

## Steps to Reproduce

1. Launch Cursor

2. Open workspace `C:\Projects\PhotoSorter`

3. Open integrated terminal (PowerShell)

4. Execute any simple command (e.g., `Get-Date` or any other)

## Actual Result

- Commands in terminal don’t execute / terminal becomes unresponsive

- **Internal Error** popup appears

- Error in stack trace (see below)

- Clearing `%APPDATA%\Cursor\User\workspaceStorage\` no longer restores functionality

## Expected Result

- Terminal executes commands stably

- No Internal Error in Cursor chat when working with terminal/agent

## Error Stack Trace

**Request ID:** `af8369f5-0104-4a3a-aa97-e456ced56ac5`

```

[internal] serialize binary: invalid int 32: 3221226505

LTe: [internal] serialize binary: invalid int 32: 3221226505

at kmf (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:38337)

at Cmf (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:37240)

at $mf (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:4395)

at ova.run (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:8170)

at async qyt.runAgentLoop (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34190:57047)

at async Wpc.streamFromAgentBackend (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34239:7695)

at async Wpc.getAgentStreamResponse (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34239:8436)

at async FTe.submitChatMaybeAbortCurrent (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9170:14575)

at async Oi (vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:32991:3808)

```

## Stack Trace Analysis

The error stack indicates a **problem in Cursor’s JavaScript code** (not in the user’s environment):

1. **All calls originate from Cursor’s compiled JS code:**

• `vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js`

• This is Cursor’s frontend bundle (Electron/VSCode-based application)

2. **Error in binary data serialization:**

• `serialize binary: invalid int 32: 3221226505`

• The value `3221226505` exceeds the maximum value for int32 (`2,147,483,647`)

• This indicates **overflow** or incorrect value during data serialization

3. **Call context:**

• `qyt.runAgentLoop` → `Wpc.streamFromAgentBackend` → `FTe.submitChatMaybeAbortCurrent`

• Error occurs during agent/chat operation, likely when transferring data between frontend and backend

**Conclusion:** This is a bug in Cursor’s code — during binary data serialization (likely when exchanging data with agent/terminal), a value is passed that doesn’t fit into int32. This could be:

- Overflow during calculations

- Incorrect handling of terminal data

- Serialization bug introduced in the update

## What I’ve Already Tried

### Workarounds Attempted (All Failed):

1. **Full cleanup** of `%APPDATA%\Cursor\User\workspaceStorage\` and Cursor restart — **didn’t help** (previously helped temporarily)

2. **Switching to Command Prompt** (as suggested in the forum thread) — **didn’t help**, the issue persists with any terminal

3. **Disabling Shell Integration:**

• Set `terminal.integrated.shellIntegration.enabled: false` — **didn’t help**

4. **Disabling Persistent Sessions:**

• Set `terminal.integrated.enablePersistentSessions: false` — **didn’t help**

5. **Disabling PowerShell Extension:**

• Disabled PowerShell Extension v2025.4.0 for workspace — **didn’t help**

6. **Using External Terminal:**

• Set `terminal.external.windowsExec: “powershell.exe”` — **didn’t help**

• Note: Manual terminals (opened outside Cursor) work fine — the issue is specific to Cursor’s integrated terminal/agent interaction

7. **Reducing terminal buffer:**

• Set `terminal.integrated.scrollback: 1000` — **didn’t help**

8. **Setting Unicode version:**

• Set `terminal.integrated.unicodeVersion: “11”` — **didn’t help**

**Important observation:** The error occurs in **client-side JavaScript code** (serialization in `workbench.desktop.main.js`), but Cursor displays it as “An unexpected error occurred on our servers” — this suggests a bug in error handling/display, where client-side errors are incorrectly labeled as server errors.

The problem appeared **immediately after the latest Cursor update**.

## Additional Information

The issue occurs with **any command** in the terminal, not just Python commands. Even simple PowerShell commands like `Get-Date` or `Get-Location` cause the terminal to break and trigger the Internal Error.

The error value `3221226505` is different from the one mentioned in the forum thread (`4294967295`), but both exceed int32 limits, suggesting a similar underlying issue.

## Request to Support

1. Confirm if the issue with `serialize binary: invalid int 32: 3221226505` and integrated terminal failure after update is known

2. Suggest which **additional logs** to collect and where to attach them (e.g., from `%APPDATA%\Cursor\logs\`) to help quickly identify the root cause

3. Investigate why a **client-side serialization error** is displayed as “server error” — this may indicate a bug in error handling/display logic

4. Since all workarounds failed, please provide:

• A fix in the next update, or

• Instructions for rolling back to the previous Cursor version, or

• Any other workarounds we haven’t tried

**Additional Request IDs from testing:**

- `26165cfe-e36c-436c-a4e9-af6742e7caa6` (from testing with disabled PowerShell Extension)

- `6fb18e00-4ac9-4250-8099-b7051b90f975` (from another test)

I can provide screenshots of the **Internal Error** popup and any logs/dumps you specify.

-–

**Note:** The problem appeared after the latest Cursor update. Previously, clearing workspaceStorage temporarily solved the issue, but now it doesn’t help.

[Lasad8133]

@deanrie do you know if there is any status on this “Serialize binary: invalid int 32 connection Error issue ? We are all getting this error now and pretty much rendering Cursor useless for us. My error is very similar and I have tried your recommendation above. Please advise if you receive any info on this from engineers at Cursor.

Request ID: eb5907a1-3582-4c04-8591-f177e2cd6ba5
[internal] serialize binary: invalid int 32: 2147516561
LTe: [internal] serialize binary: invalid int 32: 2147516561
at kmf (vscode-file://vscode-app/c:/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:38337)
at Cmf (vscode-file://vscode-app/c:/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:37240)
at $mf (vscode-file://vscode-app/c:/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:4395)
at ova.run (vscode-file://vscode-app/c:/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:8170)
at async qyt.runAgentLoop (vscode-file://vscode-app/c:/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34190:57047)
at async Wpc.streamFromAgentBackend (vscode-file://vscode-app/c:/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34239:7695)
at async Wpc.getAgentStreamResponse (vscode-file://vscode-app/c:/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34239:8436)
at async FTe.submitChatMaybeAbortCurrent (vscode-file://vscode-app/c:/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9170:14575)
at async Oi (vscode-file://vscode-app/c:/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:32991:3808)

[zhao_liang]

Where does the bug appear (feature/product)?

Background Agent (GitHub, Slack, Web, Linear)

Describe the Bug

Request ID: 4590d66c-7179-4579-80a6-93e2ca506c89
ConnectError: [internal] serialize binary: invalid int 32: 3221225477
at dou.$endAiConnectTransportReportError (vscode-file://vscode-app/c:/Users/pegasus/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12706:475325)
at JXe._doInvokeHandler (vscode-file://vscode-app/c:/Users/pegasus/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:23170)
at JXe._invokeHandler (vscode-file://vscode-app/c:/Users/pegasus/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:22912)
at JXe._receiveRequest (vscode-file://vscode-app/c:/Users/pegasus/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:21544)
at JXe._receiveOneMessage (vscode-file://vscode-app/c:/Users/pegasus/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:20361)
at pMt.value (vscode-file://vscode-app/c:/Users/pegasus/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:13633:18388)
at Ce._deliver (vscode-file://vscode-app/c:/Users/pegasus/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2962)
at Ce.fire (vscode-file://vscode-app/c:/Users/pegasus/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:3283)
at jyt.fire (vscode-file://vscode-app/c:/Users/pegasus/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12691:12156)
at MessagePort. (vscode-file://vscode-app/c:/Users/pegasus/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:15681:18406)

Steps to Reproduce

can’t use ai agent what could I do with this situation

Operating System

Windows 10/11

Version Information

can’t use error

Does this stop you from using Cursor

Yes - Cursor is unusable

[Srikanth_Gone]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Request ID: 26a56fcc-5ab9-48da-823c-de6976fdb7bd

Error: [internal] serialize binary: invalid int 32: 3762504530

When i try to use the cursor with playwright MCP or some other agent functionality i’m getting internal error and not completing the task.

Version: 2.4.22 (user setup)
VSCode Version: 1.105.1
Commit: 618c607a249dd7fd2ffc662c6531143833bebd40
Date: 2026-01-26T22:51:47.692Z
Build Type: Stable
Release Track: Default
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Windows_NT x64 10.0.26100

Steps to Reproduce

Use any Playwright MCP and make Test case design

Screenshots / Screen Recordings

Operating System

Windows 10/11

Version Information

Version: 2.4.22 (user setup)
VSCode Version: 1.105.1
Commit: 618c607a249dd7fd2ffc662c6531143833bebd40
Date: 2026-01-26T22:51:47.692Z
Build Type: Stable
Release Track: Default
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Windows_NT x64 10.0.26100

For AI issues: which model did you use?

Version: 2.4.22 (user setup)
VSCode Version: 1.105.1
Commit: 618c607a249dd7fd2ffc662c6531143833bebd40
Date: 2026-01-26T22:51:47.692Z
Build Type: Stable
Release Track: Default
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Windows_NT x64 10.0.26100

For AI issues: add Request ID with privacy disabled

Request ID: 26a56fcc-5ab9-48da-823c-de6976fdb7bd

Does this stop you from using Cursor

Yes - Cursor is unusable

[lewis2 (Lewis)]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Often during long chats, I get “Internal error” “An unexpected error occurred on our servers. Please try again, or contact support if the issue persists.” midway through the agent responding. Here are the request details:

Request ID: de719147-ff52-4eba-a3c0-3085fe8bc9d2
[internal] serialize binary: invalid int 32: 3221225477
LTe: [internal] serialize binary: invalid int 32: 3221225477
at Gmf (vscode-file://vscode-app/c:/Users/Lewis/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:38348)
at Hmf (vscode-file://vscode-app/c:/Users/Lewis/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:37251)
at rpf (vscode-file://vscode-app/c:/Users/Lewis/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:4395)
at fva.run (vscode-file://vscode-app/c:/Users/Lewis/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:8170)
at async Hyt.runAgentLoop (vscode-file://vscode-app/c:/Users/Lewis/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34196:57047)
at async Zpc.streamFromAgentBackend (vscode-file://vscode-app/c:/Users/Lewis/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34245:7695)
at async Zpc.getAgentStreamResponse (vscode-file://vscode-app/c:/Users/Lewis/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34245:8436)
at async FTe.submitChatMaybeAbortCurrent (vscode-file://vscode-app/c:/Users/Lewis/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9170:14575)
at async Ei (vscode-file://vscode-app/c:/Users/Lewis/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:32994:3808)

Steps to Reproduce

Hard to say, doesn’t always happen, but when it does I get stuck, if I respond and tell it to keep going it will get the error again quickly.

Operating System

Windows 10/11

Version Information

Version: 2.4.22 (user setup)
VSCode Version: 1.105.1
Commit: 618c607a249dd7fd2ffc662c6531143833bebd40
Date: 2026-01-26T22:51:47.692Z
Build Type: Stable
Release Track: Default
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Windows_NT x64 10.0.26200

For AI issues: which model did you use?

Error I sent was from GPT-5.2 High, after using Opus 4.5 (Thinking) for most of the chat.

For AI issues: add Request ID with privacy disabled

de719147-ff52-4eba-a3c0-3085fe8bc9d2

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

[Richard1 (Richard)]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

This is literally happening every 5-30 seconds.

I have tried closing out of the app and opening it up again. same thing happens.

If it is not this its an network error message and my network is fine.

I got these 3 errors literally in 10 seconds total… I hit try again and it loads to this.

Request ID: 9a338831-d585-4517-af85-54b9d6f3db14
[internal] serialize binary: invalid int 32: 4294967295
LTe: [internal] serialize binary: invalid int 32: 4294967295
at Gmf (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:38348)
at Hmf (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:37251)
at rpf (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:4395)
at fva.run (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:8170)
at async Hyt.resume (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34196:60450)
at async Zpc.streamFromAgentBackend (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34245:7695)
at async Zpc.getAgentStreamResponse (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34245:8436)
at async FTe.submitChatMaybeAbortCurrent (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9170:14575)

Request ID: 5a6c1315-ac06-4090-9158-08e03f61bca7
[internal] serialize binary: invalid int 32: 4294967295
LTe: [internal] serialize binary: invalid int 32: 4294967295
at Gmf (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:38348)
at Hmf (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:37251)
at rpf (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:4395)
at fva.run (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:8170)
at async Hyt.runAgentLoop (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34196:57047)
at async Zpc.streamFromAgentBackend (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34245:7695)
at async Zpc.getAgentStreamResponse (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34245:8436)
at async FTe.submitChatMaybeAbortCurrent (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9170:14575)

Request ID: 003391e6-b0d4-48c5-80f5-615da95403f9
[internal] serialize binary: invalid int 32: 4294967295
LTe: [internal] serialize binary: invalid int 32: 4294967295
at Gmf (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:38348)
at Hmf (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:37251)
at rpf (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:4395)
at fva.run (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:8170)
at async Hyt.resume (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34196:60450)
at async Zpc.streamFromAgentBackend (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34245:7695)
at async Zpc.getAgentStreamResponse (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34245:8436)
at async FTe.submitChatMaybeAbortCurrent (vscode-file://vscode-app/c:/Users/Richard/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9170:14575)

Steps to Reproduce

all I am doing is having it fix lint errors. there are quite a few and it made a plan.

it happens at random times but more so after it has ran for awhile … then the issues will happen repeatedly after hitting try again.

Expected Behavior

it just work right

Operating System

Windows 10/11

Version Information

Version: 2.4.22 (user setup)
VSCode Version: 1.105.1
Commit: 618c607a249dd7fd2ffc662c6531143833bebd40
Date: 2026-01-26T22:51:47.692Z
Build Type: Stable
Release Track: Default
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Windows_NT x64 10.0.26200

For AI issues: which model did you use?

auto and 1 agent

Does this stop you from using Cursor

Yes - Cursor is unusable

[Gadk (Gadkqznpl42540)]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

In the Pro+ plan, Cursor IDE constantly pops up an “An unexpected error occurred on our servers” error, rendering all AI features (like Chat, Agent) completely unusable. Network diagnostics show HTTP/2 connection failure, and the error log indicates an underlying binary serialization error: [internal] serialize binary: invalid int 32: 3221225477.

Steps to Reproduce

In Cursor IDE, perform any action that triggers the AI backend service (e.g., ask a question in Chat, run a command that requires Agent analysis).
The operation is immediately cancelled, and the “Internal Error” dialog pops up.
Go to Settings > Network, click Run Diagnostic. The HTTP/2 check will fail.
Click Show Logs in the error dialog to see the serialization error stack trace.

Expected Behavior

AI features should work normally. A stable connection to the backend servers should be established without serialization errors.

Screenshots / Screen Recordings

Operating System

Windows 10/11

Version Information

Version: 2.4.27 (user setup)
VSCode Version: 1.105.1
Commit: 4f2b772756b8f609e1354b3063de282ccbe7a690
Date: 2026-01-31T21:24:58.143Z
Build Type: Stable
Release Track: Default
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Windows_NT x64 10.0.26200

For AI issues: which model did you use?

AgentGPT-5.2 Codex High，GPT-5.2 Codex，Opus 4.5

For AI issues: add Request ID with privacy disabled

Request ID: 22f6e890-8c0f-4565-bcd3-bf9ce4658694
[internal] serialize binary: invalid int 32: 3221225477
LTe: [internal] serialize binary: invalid int 32: 3221225477
at $mf (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:38337)
at Fmf (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9095:37240)
at Xmf (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:5088)
at hva.run (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9096:9098)
at async qyt.runAgentLoop (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34196:57104)
at async jpc.streamFromAgentBackend (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34245:7695)
at async jpc.getAgentStreamResponse (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34245:8436)
at async FTe.submitChatMaybeAbortCurrent (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9170:14623)
at async Ei (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:32994:3808)
This points to a binary serialization failure involving an invalid 32-bit integer value (3221225477).

Additional Information

1. Network Environment: I am on a normal home network (or corporate network, if applicable). No VPN or special proxy is active. The network is stable for all other applications.
2. Full Error Stack: Provided in the bug description above.
3. Request ID Note: The detailed Request ID 22f6e890-8c0f-4565-bcd3-bf9ce4658694 is from the error log stream. The error dialog showed a different ID: 22fe890-8cdf-4565-bcd3-bfb9ce4658694.
4. Contact Email: [email protected] (for follow-up).

Does this stop you from using Cursor

Yes - Cursor is unusable

[Lasad8133]

Hi @deanrie . Do you or @Colin have any update on this issue as far as Cursor engineers are concerned? It seems that many of us are dealing with this issue and rendering Cursor unusable for us. Please update if you have anything for us. Thank you.

[Colin]

Hey all!

The team is looking into it, and we should have news to share next week.