Cursor Desktop App Does Not Sign-In After Signing In From Web

Support Bug Reports
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Hey, thanks for the report. Try a couple things:

  1. Change the proxy support setting

This is a known cause of “silent” login failures on Windows:

  • Open Cursor settings Ctrl + ,
  • Search for proxy support
  • Change Http: Proxy Support from override to on
  • Restart Cursor and try signing in again

More details here: OAuth login silently fails behind local proxy

  1. Check blockers
  • Are you using a VPN, proxy, or any traffic filtering software (like Zscaler)?
  • Try temporarily disabling your firewall or antivirus, then sign in again.
  1. Check the cursor:// protocol handler

After you click “Sign In” in the browser, do you see a prompt to open Cursor (something like “Open cursor://”)? If not, the protocol handler might not be registered. Try running Cursor as admin once, then try signing in again.

Let me know what worked. If nothing helps, we can dig deeper.

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