ConnectError: I get the error “Connection failed. If the problem persists, please check your internet connection or VPN” with Auto/Composer1

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

It constantly and comes in mid execution of code. I get the error “Connection failed. If the problem persists, please check your internet connection or VPN” with Auto/Composer1.

things I have tried:
I downgraded http to 1.1/1.0

Steps to Reproduce

use Auto/Composer1 as the model

Expected Behavior

write code without ConnectError

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.2.44 (system setup)
VSCode Version: 1.105.1
Commit: 20adc1003928b0f1b99305dbaf845656ff81f5d0
Date: 2025-12-24T21:41:47.598Z
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 10.0.26200

For AI issues: which model did you use?

tried with Auto/Composer1

For AI issues: add Request ID with privacy disabled

Request ID: 99fe1197-63b4-4544-91c9-aadabfc6813f

Does this stop you from using Cursor

Yes - Cursor is unusable

2

This is a known network issue related to HTTP/2. Please try the following:

  1. Settings → search “HTTP/2” → enable “Disable HTTP/2” → restart Cursor

  2. Settings → Network → Run Diagnostics → screenshot the result

  3. Are you using a VPN/proxy/corporate network? Try without them or on a different network

Similar cases resolved by disabling HTTP/2:

Let me know if disabling HTTP/2 helped.

3 
 1. Settings → search “HTTP/2” → enable “Disable HTTP/2” → restart Cursor

[ANs]: There is NO enable/disable HTTP/2.0 instead i could select HTTP/1.1

  1. Settings → Network → Run Diagnostics → screenshot the result

ConnectionError
ConnectionError1533×970 37.9 KB

  1. Are you using a VPN/proxy/corporate network? Try without them or on a different network
    [Ans]: NO
4

Hey, thanks for the report.

Since the error happens mid-execution, we’ll need a bit more detail:

  • Did you restart Cursor after switching to HTTP/1.1?
  • Does the error happen on every request, or only sometimes?
  • Roughly after how much time or how many messages does it crash?
  • Go to Help > Toggle Developer Tools > Console, reproduce the issue, and send a screenshot of the console with the red errors
  • Copy the new Request ID right after the error (chat menu > Copy Request ID)
  • Do you have any MCP servers set up? (Cursor Settings > Tools & MCP) If yes, try disabling them temporarily and check if the issue still happens

This will help us share the case with the dev team.