PROXY-Related Bugs in CURSOR's AGENT After VPN Operations

[gengengengengen (Jaeson Wong)]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

I have identified a type of PROXY-related bug in CURSOR’s AGENT:

After switch/shutdown and restoring the VPN, CURSOR’s AGENT does resume responsiveness, but three distinct issues occur:
Task processing gets stuck on a specific file and won’t move forward at all;
The AGENT can respond smoothly until it finishes its answer, but it doesn’t make any modifications to the code—it seems to mistakenly think it has already completed the edits;
In the Context section, any referenced files or folders show a “dashed border + triangular exclamation mark” prompt (indicating an error or unrecognized state)

Steps to Reproduce

1. Prerequisites
   First, I configured a proxy (PROXY) for CURSOR and enabled the proxy’s tun mode. At this initial stage, CURSOR worked perfectly without any issues.
2. Trigger Scenario
   The problem started after I performed actions on my VPN—specifically, when I switched VPN modes, turned the VPN on/off, and then reconnected to the VPN (restored the VPN connection).
3. Abnormal Phenomena
   After restoring the VPN, CURSOR’s AGENT does resume responsiveness, but three distinct issues occur:
   Task processing gets stuck on a specific file and won’t move forward at all;
   The AGENT can respond smoothly until it finishes its answer, but it doesn’t make any modifications to the code—it seems to mistakenly think it has already completed the edits;
   In the Context section, any referenced files or folders show a “dashed border + triangular exclamation mark” prompt (indicating an error or unrecognized state).
4. Temporary Workaround
   So far, the only way I’ve been able to fix these issues is by reinstalling CURSOR entirely.
5. Additional Notes
   This bug isn’t related to whether http 2 mode is enabled or disabled—I’ve encountered the same problem in both states.

Expected Behavior

Agent response and generate code as expect after restore VPN connection without Reinstall Cursor.

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.6.35 (system setup)
VSCode Version: 1.99.3
Commit: b753cece5c67c47cb5637199a5a5de2b7100c180
Date: 2025-09-19T17:39:38.846Z
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26100

For AI issues: which model did you use?

Claude 4 sonnet / Auto

Does this stop you from using Cursor

Yes - Cursor is unusable

[sanjeed5 (Sanjeed)]

Can you share Network diagnostics please?

Go to Cursor Settings > Network and click Run Diagnostics. This will test your connection to Cursor’s servers and help identify any network-related issues that might be affecting AI features, updates, or other online functionality.

[gengengengengen (Jaeson Wong)]

Thank you for your reply.

In my case, the VPN has been reconnected, the Agent is responding normally, and all diagnostic items have passed the check.

The real issue occurs after network restoration: the Agent shows warnings in the folder context, and fails to modify the code.

[sanjeed5 (Sanjeed)]

I’m glad that your issue is resolved.

The folder warning means that it condensed the file to fit the context. I would generally recommend not passing in entire folders, as it can bloat the context and result in worse agent performance.

Also, instead of trying to do a large task in a single chat, you can try splitting it into multiple smaller chats.