Hi Cursor Support,
I’m repeatedly getting a “Connection Error” while using Cursor Agent. The message says: “Connection failed. Please try again, or contact support if the issue persists.”
Request ID: f2f92305-d5fa-41fe-a149-6a548b2a5a90
Restarting and retrying does not resolve the issue. Please help me investigate this connection problem.
Hey, thanks for the report with the Request ID, that helped me check things quickly. From the logs, the request never reached our servers, and your account looks totally healthy. That means the connection is getting cut off at the transport layer, usually due to a corporate proxy, VPN, or SSL inspection like Zscaler or Palo Alto, or an unstable ISP or VPN route. Since 3.9.x, AI features use a separate HTTP/2 transport, and some proxies block it even when regular internet still works.
What to try, in order:
- Settings > Network > Run Diagnostics and see which checks fail.
- Switch HTTP Compatibility Mode to HTTP/1.1, then fully quit and relaunch Cursor, not just reload. This fixes most cases, you only lose a bit of latency.
- Update Cursor to the latest version 3.10 or newer, there was a fix related to proxy settings being ignored.
- If you’re on a corporate network or behind a VPN, try turning off the VPN temporarily, or add these to your allowlist:
*.cursor.sh,*.cursor.com,*.cursorapi.com,*.cursor-cdn.com.
The error is retriable, so resending often works, which also suggests the server side is fine.
Let me know if HTTP/1.1 helped. If it still happens even on a non proxied network, tell me and we can dig in further.