Keep getting Connection failed. If the problem persists, please check your internet connection or VPN

[kharonsec]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Hello, It’s been a few days now that i get a lot of connection errors from Cursor.
I tried to disable HTTP2 like i saw in a other discussion but it did not resolve the issue…
I have also disabled my VPN but the problem is still there, restarting the app fixes the problem temporarily but it comes back after one prompt.

Steps to Reproduce

The problem happens when using agent mode of Cursor, nothing special is done.

Expected Behavior

Agent is unable to answer prompt

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.2.36 (user setup)
VSCode Version: 1.105.1
Commit: 55c9bc11e99cedd1fb93fbb7996abf779c583150
Date: 2025-12-18T06:25:21.733Z
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 mode

For AI issues: add Request ID with privacy disabled

Request ID: d485091f-d753-420c-906b-04b1ef9f3b10

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

[deanrie]

Hey, thanks for the report.

I see HTTP/2 is already disabled. Let’s try a few other fixes:

Quick checks:

1. Disable MCP servers if they’re enabled: Settings → Cursor → MCP. This helped another user with a similar issue - Repeatedly says connection issue when my connection is fine - #4 by STF
2. Launch Cursor without extensions: run cursor --disable-extensions in your terminal and try a new chat
3. Check your firewall/antivirus - it might be blocking Cursor’s connections

Diagnostics needed:
Please share:

• Settings → Network → Run Diagnostics - a screenshot of the result
• Help → Toggle Developer Tools → Console - copy any errors
• Are you using a firewall/antivirus or a corporate proxy?
• Do you have any MCP servers set in Settings → Cursor → MCP?

Similar solved topics:

• Constant connection error
• Connection failed for all new chats

Let me know the diagnostics results.