Agent execution timed out - ERROR_EXTENSION_HOST_TIMEOUT

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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

When asking question to agent - > it shows → Planning next moves → Reconnecting - ?> Agent Execution Timed Out
The agent execution provider did not respond in time. This may indicate the extension host is not running or is unresponsive.

Request ID: e5da7744-77b2-45ca-9ffd-76f7a6e3ec7d
{“error”:“ERROR_EXTENSION_HOST_TIMEOUT”,“details”:{“title”:“Agent Execution Timed Out”,“detail”:“The agent execution provider did not respond in time. This may indicate the extension host is not running or is unresponsive.”,“isRetryable”:false,“shouldShowImmediateError”:true,“additionalInfo”:{},“buttons”:[{“label”:“Reload Window”,“reloadWindow”:{}}],“planChoices”:}}
Agent Execution Timed Out [deadline_exceeded]
ConnectError: [deadline_exceeded] Agent Execution Timed Out

Steps to Reproduce

When asking question to agent - > it shows → Planning next moves → Reconnecting - ?> Agent Execution Timed Out
The agent execution provider did not respond in time. This may indicate the extension host is not running or is unresponsive.

Request ID: e5da7744-77b2-45ca-9ffd-76f7a6e3ec7d
{“error”:“ERROR_EXTENSION_HOST_TIMEOUT”,“details”:{“title”:“Agent Execution Timed Out”,“detail”:“The agent execution provider did not respond in time. This may indicate the extension host is not running or is unresponsive.”,“isRetryable”:false,“shouldShowImmediateError”:true,“additionalInfo”:{},“buttons”:[{“label”:“Reload Window”,“reloadWindow”:{}}],“planChoices”:}}
Agent Execution Timed Out [deadline_exceeded]
ConnectError: [deadline_exceeded] Agent Execution Timed Out
sktop.main.js:35854:1995)

Expected Behavior

When asking question to agent - > it shows → Planning next moves → Reconnecting - >
Agent Execution Timed Out

Operating System

Windows 10/11

Version Information

Version: 3.7.21 (user setup)
VS Code Extension API: 1.105.1
Commit: 517f696d8ab6c53eb04fbfdaae705cd146bf3460
Date: 2026-06-07T21:46:09.237Z
Layout: editor
Build Type: Stable
Release Track: Default
Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
xterm.js: 6.1.0-beta.256
OS: Windows_NT x64 10.0.26200

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Request ID: e5da7744-77b2-45ca-9ffd-76f7a6e3ec7d
{“error”:“ERROR_EXTENSION_HOST_TIMEOUT”,“details”:{“title”:“Agent Execution Timed Out”,“detail”:“The agent execution provider did not respond in time. This may indicate the extension host is not running or is unresponsive.”,“isRetryable”:false,“shouldShowImmediateError”:true,“additionalInfo”:{},“buttons”:[{“label”:“Reload Window”,“reloadWindow”:{}}],“planChoices”:}}
Agent Execution Timed Out [deadline_exceeded]
ConnectError: [deadline_exceeded] Agent Execution Timed Out

Additional Information

If this issues is not resolved, then cursor is unuable for me. And i have to move to other tools.

In cursor terminal i have pinged and i ma getting the response but no response from agents.
ping 8.8.8.8
ping google.com

Does this stop you from using Cursor

Yes - Cursor is unusable

5

Hey, thanks for the detailed report. The version, OS, and Request ID help a lot. This is a known bug with ERROR_EXTENSION_HOST_TIMEOUT. The extension host doesn’t start the agent exec provider in time, so the agent times out and disconnects. It shows up most often on Windows. We’re tracking it, but I can’t share an exact ETA for a fix yet.

What you can try right now to unblock yourself:

  1. Reload Window using the button in the error, or fully restart Cursor. This often helps temporarily.
  2. Test without extensions. Close Cursor, then run cursor --disable-extensions from a terminal. If the agent works, one of your heavier extensions is likely causing it.
  3. Check Process Explorer. Press Ctrl+Shift+P then run Developer: Open Process Explorer, and see if extensionHost is stuck with high CPU usage.

Your network looks fine since ping works, so this isn’t a network issue. It’s the local extension host.

If the error comes back after a restart or disabling extensions, let me know and we’ll note it in the thread. When we have an update on the fix, I’ll reply here.

7

Hi
I tried cursor --disable-extensions
Internal Error
An unexpected error occurred on our servers. Please try again, or contact support if the issue persists.
Request ID: 58556a0c-3fee-4ac7-8f01-593e609e6ab5
[unknown] Network disconnected
Rpe: [unknown] Network disconnected

extensionHost current cpu usge id 0%.
Reload window disn’t work.

What can i do ?

8

Hey, thanks for running through the steps. The fact that extensionHost is now at 0% CPU and you’re seeing a new Network disconnected changes things. It looks like it’s not just a stuck extension host, but that the connection to our servers is dropping. Since you’re on a corporate domain, those networks often have a proxy, SSL inspection, or Zscaler that can break streaming. That’s a common reason for disconnects like this.

Let’s check in this order:

  1. Network Diagnostics. Cursor Settings > Network > Run Diagnostics. Paste the result here, it’ll show which domains aren’t reachable.
  2. Disable HTTP/2. Settings > Network > change to HTTP/1.1. Restart Cursor and test the agent again. This flag often fixes disconnects behind corporate proxies.
  3. VPN/Proxy. If you’re on a corporate VPN or proxy, try turning it off for a minute, or test on another network like a mobile hotspot, then see if the agent works. This helps confirm whether it’s network-related.

If it works on another network or after disabling HTTP/2, your corporate proxy or firewall is likely blocking the requests. Then your IT team will need to allowlist *.cursor.sh and disable buffering or SSL inspection for those domains.

Let me know what Network Diagnostics shows and whether disabling HTTP/2 helped.