Error: Error POSTing to endpoint (HTTP 404): {"error":"404 Not Found"}

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor CLI

Describe the Bug

When i try to login using cursor cli it gives
Error (unhandledRejection): Error POSTing to endpoint (HTTP 404): {“error”:“404 Not Found”}
Error: Error POSTing to endpoint (HTTP 404): {“error”:“404 Not Found”}
at StreamableHTTPClientTransport.send (/Users//.local/share/cursor-agent/versions/2025.12.17-996666f/index.js:165206:23)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)

Steps to Reproduce

  1. Log out of cursor cli
  2. Login using command cursor-agent

Expected Behavior

It should login as usual.

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Cursor cli version using cursor-agent --version → 2025.12.17-996666f

For AI issues: which model did you use?

NA

Does this stop you from using Cursor

Yes - Cursor is unusable

2

Hey, thanks for the report. An HTTP 404 during CLI login usually points to an issue with the auth endpoint.

Please try these steps:

  1. Use an API key as a workaround:

    • Create an API key in the Cursor Dashboard (Integrations > User API Keys)
    • Use: export CURSOR_API_KEY=your_key or cursor-agent --api-key your_key

  2. Check your network:

    • Disable VPN or proxy if you use one
    • Check if other Cursor features work (try opening the IDE and running Cursor Settings > Network > Run Diagnostics)

  3. Try updating the CLI:

    cursor-agent update

Please share:

  • Are you using a VPN or a corporate proxy?
  • The output of cursor-agent status
  • Did the API key workaround help?

If the issue still happens even with an API key, it might be a bug in the latest CLI version and I’ll escalate it to the dev team.