I was working on a project, and when I tried to read the cargo documentation, the cursor gave me a connection error: Request ID: 02a71e9c-6229-49c0-b12e-867b97223c80
I tried resetting the cursor - nothing.
Diagnostics showed everything was working, but ultimately the same problem persisted.
I tried switching HTTP versions - no help.
Steps to Reproduce
Give him an original task like mine—to create an app that mirrors games.
He’ll start studying the latest RAST documents—that’s where the problem will be.
Expected Behavior
Perform the study and do not crash, do not complain about the connection - it is stable
Thanks for the screenshot! The issue is clear - the Agent successfully ran cargo build, then failed with a connection error when trying to continue.
This likely points to a bug in how the Agent handles command output or the next step after a successful terminal command. To help engineering fix it, please:
Get console logs: Help > Toggle Developer Tools > Console
Reproduce the error (run the same Agent task with cargo build)
Screenshot or copy any red errors from the Console
Copy the Request ID: when the error appears, click the three-dots menu → Copy Request ID
This will help pinpoint where the Agent fails. I’ll escalate this to engineering with your details.
I think the crash happens because my Rust code sends some value (like 4294967295) as a status or exit code, but your JS side expects a regular int32. That causes a serialization error, breaks the connection, and I get this “Connection Error” instead of a real build result.
Thank you for your responsiveness. I found a temporary solution: ask the cursor to create an intermediate Python script that runs cargo commands so it doesn’t have to run them manually. Then the crash won’t happen. So for now, I’ll have to use this workaround until they fix it =)
Maybe consider building this type check or exit code conversion into the agent directly, so users don’t have to workaround it themselves in the future. It would save time and prevent crashes for everyone.
I’m experiencing a connection failure when executing the PowerShell command cargo check 2>&1 in Cursor’s terminal. The error message states: “Connection failed. If the problem persists, please check your internet connection or VPN.”
Issue Summary:
Cursor AI Agent frequently crashes during terminal operations like cargo check, displaying a warning about internet/VPN connectivity. Once triggered, the agent thread becomes unrecoverable—either crashing outright or getting stuck indefinitely at “Planning next moves.”
Warning Message:
Connection failed. If the problem persists, please check your internet connection or VPN.
Troubleshooting Attempts So Far:
Switched from HTTP/2 to HTTP/1.1 as suggested in other forum threads.
Reinstalled Cursor.
Verified that internet is stable and functional across other apps on the same PC.
Not using a VPN.
Ran Cursor’s network diagnostics—no issues reported.
Impact on Workflow:
This bug makes it impossible to continue using the original agent thread. I’m forced to manually duplicate the “Build” plan before each execution, hoping the new agent can reconstruct context from the copy. Unfortunately, this workaround breaks continuity—new agents can’t interact with the original plan, which severely limits usability.
Steps to Reproduce
Here is the specific powershell command that crashed the agent (but not limited to):
cd src-tauri; cargo check --message-format=short 2>&1 | Select-Object -First 50
Expected Behavior
Should not crash and should not kill the entire thread.
Operating System
Windows 10/11
Current Cursor Version (Menu → About Cursor → Copy)
