The cursor seems to have a bug, causing connection failures

[liang_ding]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

It seems that running tests built with Playwright via cursor can trigger a denial-of-service bug? Today I had the auto model build an automated test suite, and then the problem suddenly appeared. After triggering it, almost all requests resulted in the error message: “Connection failed. If the problem persists, please check your internet connection or VPN.”
I’m quite certain my network is fine because everything was working normally before this bug occurred. Even after the cursor malfunctioned, my network connection remained normal. Currently, it seems the only solution to this problem is to completely uninstall and reinstall the software.

Steps to Reproduce

I had the auto model build an automated test suite, and then the problem suddenly appeared. After triggering it, almost all requests resulted in the error message: “Connection failed. If the problem persists, please check your internet connection or VPN.”

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.64 (system setup)
VSCode Version: 1.99.3
Commit: 25412918da7e74b2686b25d62da1f01cfcd27680
Date: 2025-11-06T04:35:14.424Z
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?

auto

Does this stop you from using Cursor

Yes - Cursor is unusable

[deanrie]

Hey, thanks for the report. Try disabling HTTP/2:

Settings Ctrl + , → search “HTTP/2” → enable “Disable HTTP/2” → restart Cursor

This fixes connection errors for most users.

Also check your firewall/antivirus - sometimes Windows blocks the updated app and you need to allow it again.

If you have MCP servers set up, try disabling the ones you’re not using (there’s an 80 tool limit).

If that doesn’t help, run network diagnostics: Settings → Network → Run Diagnostics

Let me know if it works.