Login Issue: Web login successful but fails to sync/callback to Cursor Desktop

[deanrie]

Hey, on Windows this is usually fixed by changing one setting. Try this workaround:

1. Change Http: Proxy Support from override to on
   • Open Cursor settings: Ctrl+,
   • In the settings search, type proxy support
   • Change Http: Proxy Support from override to on
   • Restart Cursor and try logging in again

More details about this bug:

• OAuth login silently fails behind local proxy — fix is changing one default setting
• Cursor Desktop App Does Not Sign-In After Signing In From Web

If that didn’t help, also check:

2. Traffic blockers: are you using a VPN, proxy, or something like Zscaler or a corporate filter? Try temporarily disabling your firewall or antivirus, then log in again.

3. cursor:// protocol handler: after you log in in the browser, do you see the prompt “Open cursor://…”? If not, the handler might not be registered. Run Cursor once as admin, then try again.

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