Hey, thanks for the report.
This error is commonly caused by MCP servers or network settings. Let’s check a few things:
Quick fix to try first:
- If you have MCP servers configured, try disabling them temporarily - this fixed similar issues for other users
Diagnostics needed:
- Cursor Settings > Network > Run Diagnostics - share a screenshot
- Disable HTTP/2: Press
CMD+,> search “HTTP/2” > enable “Disable HTTP/2” > restart Cursor - Test with clean profile:
cursor --user-data-dir=/tmp/cursor-testfrom terminal
Please also share:
- 2-3 Request IDs from failed attempts (Chat menu > Copy Request ID)
- What extensions do you have installed?
- Are you using any MCP servers?
- What region/country are you in?
- Using VPN or proxy?
Similar solved case where MCP servers were the cause: GPT-5.2 - agent mode not working
Let me know what you find.