Connection Error - Connection failed

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Cursor stops working after every prompt
Connection failed. If the problem persists, please check your internet connection or VPN
Even though the internet is stable and I dont use any VPN.

Steps to Reproduce

give a prompt to the agent and wait for 30 seconds and it stops working

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.77 (user setup)
VSCode Version: 1.99.3
Commit: ba90f2f88e4911312761abab9492c42442117cf0
Date: 2025-11-13T23:10:43.113Z
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?

Sonnet 4.5

For AI issues: add Request ID with privacy disabled

Request ID: a42dd94c-fdb3-413d-b1a4-d2c2df5ad188

Does this stop you from using Cursor

Yes - Cursor is unusable

2

Hey, thanks for the report.

This is a known connection issue. Please try these steps in order:

  1. Disable HTTP/2 (most common fix):
  • Open Cursor Settings Ctrl+,
  • Search for “HTTP/2”
  • Enable “Disable HTTP/2”
  • Restart Cursor
  1. Check MCP servers (if you have any configured):
  • Cursor has an 80-tool limit
  • Disable MCP servers you’re not actively using
  1. Check firewall/antivirus:
  • Windows may need to re-allow internet access for the updated app version
  1. Run network diagnostics:
  • Cursor Settings → Network → Run Diagnostics

Most users resolve this with step 1. Let me know if that helps.

3

Try accessing a new chat; the error will no longer occur.

1 Like
4

That doesn’t solve for me. It has issues with connection in new chat too. Until today it works nice, and internet connection works well.

5

Didn’t help for me. Seems there is some outage as network diagnostics shows “[unknown] Network disconnected“

6

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