Where does the bug appear (feature/product)? Cursor IDE Describe the Bug For the last 4 hours or so, every prompt I enter in the agent chat returns “Unexpected error”. Steps to Reproduce Open a new agent, enter any prompt. After a while, it errors out: An unexpected error occurred. Request ID: af63f775-da52-4eb4-a2cc-01110e5ba304 Operating System Windows 10/11 Version Information Version: 3.28.5 (user setup) VS Code Extension API: 1.128.0 Commit: 18b4e7e5fb7fc450d7797e36c596c31aedaf59f0 Date: 2026-10-28T06:35:30.580Z Layout: Agent Window Build Type: Stable Release Track: Default Electron: 42.11.16 Chromium: 148.0.7778.280 Node.js: 24.19.0 V8: 14.8.178.38-electron.0 xterm.js: 6.1.0-beta.291 OS: Windows_NT x64 10.0.26300 Additional Information Tried switching to HTTP/1.1 in settings but it didn’t help. Does this stop you from using Cursor Yes - Cursor is unusable

I’m also seeing this issue. It works if I uninstall and reinstall version 3.27.22, but once it auto updates, the issue returns. I have also tried switching to HTTP/1.1. The network diagnostics all show green.

Similar - my says not delivered, resent on grokbot desktop; cursor just won’t connect and hangs

Request ID: 626d1410-0ed7-44f1-956d-8cf09bb288ca An unexpected error occurred. The agent couldn’t start because Cursor’s agent process didn’t respond. Retry, or reconnect if you’re using a remote host; if it keeps failing locally and antivirus or a proxy inspects HTTPS traffic, run Network Diagnostics in Cursor Settings. AgentTurnClassifiedError: The agent couldn’t start because Cursor’s agent process didn’t respond. Retry, or reconnect if you’re using a remote host; if it keeps failing locally and antivirus or a proxy inspects HTTPS traffic, run Network Diagnostics in Cursor Settings. at JLl (vscode-file://vscode-app/c:/Users/admin/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.glass.main.js:2597:25621) at async Gmu._waitForAgentHostBridgeBoundedInner (vscode-file://vscode-app/c:/Users/admin/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.glass.main.js:23046:5325) at async Gmu._waitForAgentHostBridgeBounded (vscode-file://vscode-app/c:/Users/admin/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.glass.main.js:23046:5146) at async Gmu._waitForPushRequestContextProviderRegistration (vscode-file://vscode-app/c:/Users/admin/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.glass.main.js:23046:4751) at async xB (vscode-file://vscode-app/c:/Users/admin/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.glass.main.js:2511:169101) at async vscode-file://vscode-app/c:/Users/admin/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.glass.main.js:23046:14288 at async xB (vscode-file://vscode-app/c:/Users/admin/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.glass.main.js:2511:169101) at async Promise.all (index 0) at async vscode-file://vscode-app/c:/Users/admin/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.glass.main.js:23046:16274 at async Gmu.streamFromAgentBackend (vscode-file://vscode-app/c:/Users/admin/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.glass.main.js:23046:16031)

Where does the bug appear (feature/product)? Cursor IDE Describe the Bug Agents Window fails with: “An unexpected error occurred” Local logs show: errorCode: agent_host_bridge_unavailable “Agent host bridge registration wait exhausted before the send left the client” registrationReason / state consistent with bridge never registered in glass window (~70s wait, 9 attempts) runtime reason: managed-local-unavailable layout: glass Important: IDE Agent (Open IDE / classic editor Agent chat) works normally Only Agents Window is affected Happens on new chats and resumed chats cursor.general.disableHttp2 is already true %APPDATA%\Cursor\agent-harness folder is missing There is also an old leftover install at C:\Program Files\Cursor (3.5.33) that I cannot delete (no admin). Launching via user install 3.28.5 still reproduces the Agents Window failure. Steps to Reproduce Launch Cursor 3.28.5 from: C:\Users\abankar\AppData\Local\Programs\cursor\Cursor.exe Open Agents Window Open a new chat (or resume an existing one) in a local project Send “hi” / any message After ~60–70 seconds: “An unexpected error occurred” Expected Behavior Agents Window agent responds like IDE Agent. Screenshots / Screen Recordings [Screenshot 2026-10-29 093451] Operating System Windows 10/11 Version Information Cursor 3.28.5 Channel: stable For AI issues: add Request ID with privacy disabled Request IDs Earlier: b9e5a9ce-1fe4-4c7c-aa2f-8f56d9a5fa5a 05c49fe3-f759-48e6-b838-8ab0725699c0 From today’s sessions: 9ea12cdd-c680-4d64-8824-4777772951b7 69b30e64-67fa-4653-924d-d74098907893 a8bca977-8830-4f1c-b2f1-ed46fa42925f a345b6ec-9741-4764-a8f4-5becf9b03230 ffb8eb5a-a956-4c5e-be76-47bde9ff0cab cee0292a-a5ba-4716-a99d-bf910cb5bd73 Additional Information Glass window fails waiting for bridge; IDE window2 later registers Agent Host (example: timeToBridgeRegisterMs: 3189) Selected runtime: connect, reason: managed-local-unavailable Also saw ConnectError / Unable to reach the model provider around Agents Window startup Many MCP servers enabled (Atlassian, Qase, Perforce, Figma, Chrome DevTools, POS DB, etc.) — Extension Host can be slow at startup Workaround: Ctrl+Shift+P → Open IDE (Agent chat works there) What I already tried Fully quit Cursor + kill leftover Cursor processes + relaunch 3.28.5 Waiting before first Agents Window message Using Desktop shortcut to LocalAppData 3.28.5 (not Program Files 3.5.33) HTTP/2 already disabled Cannot uninstall/delete Program Files Cursor (no admin rights) Does this stop you from using Cursor Yes - Cursor is unusable

Hey all, This is an issue we’re aware of affecting Windows users on 3.28. We’ve identified a fix and will roll it out soon. In the meantime, you can downgrade to 3.27 by downloading it from Cursor · Download.

Where does the bug appear (feature/product)? Cursor IDE Describe the Bug Local agents are completely broken. Every new chat fails immediately with: An unexpected error occurred. The agent couldn’t start because Cursor’s agent process didn’t respond. Request IDs: 1d535d96-936c-4707-a80b-184bd70b028c 6e6afd92-2cc5-4e17-ba6e-d42028041002 2fb82bef-20db-414e-8cfa-f356a905e981 Environment: Windows 11 (Lenovo ThinkPad X1) Cursor latest (3.28.x) Project opened via File → Open Folder Model: Grok 4.7 High Fast (happens on all models) What I’ve already tried: Fully quit + killed all Cursor processes in Task Manager Restarted PC Set HTTP Compatibility Mode to HTTP/1.1 Temporarily disabled Microsoft Defender Added exclusions for: %LOCALAPPDATA%\Programs\cursor %APPDATA%\Cursor %USERPROFILE%\.cursor Started brand new chats after opening the project folder Cloud agents work, but I need local agents for the IDE browser. This started after removing workspaces from the sidebar; it was working before. I can provide Network Diagnostics or the Capture and Send Debugging Data zip if needed. Steps to Reproduce Open project with File → Open Folder Start a new agent chat Type “hi” and send Error appears instantly Expected Behavior Local agent starts and responds. Screenshots / Screen Recordings [Screenshot 2026-10-29 120244.png][Screenshot 2026-10-29 114503.png][Screenshot 2026-10-29 000400.png] Operating System Windows 10/11 Version Information Version: 3.28.5 (user setup) VS Code Extension API: 1.128.0 Commit: 18b4e7e5fb7fc450d7797e36c596c31aedaf59f0 Date: 2026-10-28T06:35:30.580Z Layout: IDE Build Type: Stable Release Track: Default Electron: 42.11.16 Chromium: 148.0.7778.280 Node.js: 24.19.0 V8: 14.8.178.38-electron.0 xterm.js: 6.1.0-beta.291 OS: Windows_NT x64 10.0.26300 For AI issues: which model did you use? Grok 4.7 High Fast (also fails on all other models and Auto) For AI issues: add Request ID with privacy disabled 1d535d96-936c-4707-a80b-184bd70b028c 6e6afd92-2cc5-4e17-ba6e-d42028041002 Additional Information Windows 11 (Lenovo ThinkPad X1). This started after removing workspaces from the sidebar (it worked before). Cloud agents work; I need local agents for the IDE browser. Does this stop you from using Cursor Yes - Cursor is unusable

Where does the bug appear (feature/product)? Cursor IDE Describe the Bug An unexpected error occurred. Request ID: e35a6688-6148-4da0-820d-9c626805c880 Steps to Reproduce Trying to ping Hello using cursor agent IDE Expected Behavior Chat should respond Screenshots / Screen Recordings [Screenshot 2026-10-29 115437.png] Operating System Windows 10/11 Version Information Version: 3.28.5 (user setup) VS Code Extension API: 1.128.0 Commit: 18b4e7e5fb7fc450d7797e36c596c31aedaf59f0 Date: 2026-10-28T06:35:30.580Z Layout: IDE Build Type: Stable Release Track: Default Electron: 42.11.16 Chromium: 148.0.7778.280 Node.js: 24.19.0 V8: 14.8.178.38-electron.0 xterm.js: 6.1.0-beta.291 OS: Windows_NT x64 10.0.26300 For AI issues: which model did you use? Auto Balance For AI issues: add Request ID with privacy disabled Request ID: e35a6688-6148-4da0-820d-9c626805c880 Does this stop you from using Cursor Yes - Cursor is unusable

Where does the bug appear (feature/product)? Cursor IDE Describe the Bug Where: Cursor IDE, Agent chat Model: Auto Request ID: 11a842e5-1973-4e89-b45c-41e397676828 Actual behavior: The chat failed with “An unexpected error occurred. Request ID: 11a842e5-1973-4e89-b45c-41e397676828”. Could you look up this Request ID and tell me whether the request reached your servers or was dropped on the way? Thanks. Steps to Reproduce Use the Auto model in Cursor Agent chat and send a message; the error appears. Expected Behavior The Auto model request completes normally. Operating System Windows 10/11 Version Information Version: Cursor 3.28.5 (User install), distro/commit d5c0e77a0214208f36b56d42e8e787de88d02ea4 OS: Windows For AI issues: which model did you use? Auto For AI issues: add Request ID with privacy disabled Request ID: 11a842e5-1973-4e89-b45c-41e397676828 Does this stop you from using Cursor Sometimes - I can sometimes use Cursor

Where does the bug appear (feature/product)? Cursor IDE Describe the Bug Hello, this morning it seems I cannot connect to Cursor server from both, Cursor local IDE and Browser CLI. The error I’m facing is: Agent encountered an error The agent stopped because of an unexpected error. Retry or send a follow-up below. Steps to Reproduce any prompt fails Expected Behavior work without any issues like yesterday and days before Screenshots / Screen Recordings [screenshot.png]logs_http_1_1.txt (4.51 KB) Operating System Windows 10/11 Version Information PS C:\Users\Administrator> agent -version 2026.10.22-27dcf5f PS C:\Users\Administrator> agent about About Cursor CLI CLI Version 2026.10.22-27dcf5f Latest 2026.10.22-27dcf5f (up to date) Model Auto Subscription Tier Pro OS win32 (x64) Terminal unknown Shell cmd User Email f.franceschetti@protonmail.com For AI issues: which model did you use? _ For AI issues: add Request ID with privacy disabled _ Additional Information _ Does this stop you from using Cursor Yes - Cursor is unusable

I checked in the Browser & Diagnostic and it seems that the “Network Diagnostic” is ok until the last step CDN. It fails with the following log: CDN Failed to fetch [2026-10-30T05:43:14.067Z] Host: cursor-cdn.com [2026-10-30T05:43:14.156Z] Error: TypeError: Failed to fetch I have already replaced the option HTTP/2 with1.1 and 1.0, but nothing changed. Please help me with priority since I’m going long with my project deadline. Thanks, Federico Franceschetti

"Unexpected error" after every prompt

Support Bug Reports

Colin (Colin) November 2, 2026, 9:25pm 48

Hey all,

Just bumping this information that affected users should downgrade to 3.27!

Topic		Replies	Views
Unable to use cursor. Cursor IDE Agents: "An unexpected error occurred" when sending a chat Bug Reports chat , cloud-agents	1	175	September 22, 2026
An unexpected error occurred Bug Reports chat	1	95	October 29, 2026
An unexpected error occurred. Request ID: acd028de-c03d-4211-a013-f248c9265810 Bug Reports chat	3	90	September 22, 2026
Title: Cursor Agent Failed to Start – Agent Process Didn't Respond Bug Reports chat	3	55	November 9, 2026
None of the agents are working from this morning Bug Reports chat , networking	7	244	September 20, 2026

"Unexpected error" after every prompt

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