Login incomplete No Synchronization

Support Help
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1

I logged in, the message “Log in to Cursor Desktop?” appeared then I click on the button Yes, Log In button. I wait … Nothing happens afterward in the Cursor application… I’m still see Sign Up and Log In Button No Synchronization…

I tried with Firefox and Google same problem.

Cursor (Last version) is installed into Ubuntu 24.

I have tried to login Cursor through another machine then I installed cursor this time on Ubuntu 22. The app asked me (Cursor) to login what I did it was going fine so far then the system tells me to return to Cursor application… I still see the login page nothing has changed… I am still not able to go in Cursor application. Did I miss something ?

5

Hey, this is a known Linux thing. The browser login finishes fine, but the IDE keeps checking the backend via polling, and the default Electron setting Http: Proxy Support = override can sometimes silently block those requests, so the login looks like it’s stuck.

Try this:

  • Open Cursor, press Ctrl+, for Settings.
  • Search for Http: Proxy Support.
  • Change it from override to on.
  • Restart Cursor and try signing in again.

Same fix helped in similar threads:

Let me know if it still doesn’t work. Then we can dig deeper with logs, proxy or VPN, and firewall checks.

6

Hello,

      I am unable to open Cursor on my local machine... since the system is not able to authenticate my user.

      There is no Proxy Support in My Settings in my profile on cursor.com page.  Did I Missed something ?

      I had already tried to disable the proxy through Firefox it didn't work. I checked too on Ubuntu System. The proxy is disable. 

      I sent to Sam (Support) lot of tests that I did I never been able to make run Cursor on either Ubuntu 24 or 22.

      I tried on two different machines and got the same issue..

      I am not getting any error message. The login page waiting the response...of login.

      I don't use Zscaler.

      Thank you for your help.

     

      Yves
7

I found the problem and the solution. I had a ERR_PROXY_CONNECTION_FAILED while the login process.
The http_proxy variable was defined ( through the command env | grep proxy ) then I removed with the command unset http_proxy (temporary fix). I restart cursor from the same terminal and the authentication worked.

9

Great self-debug, Yves, thanks for coming back with the solution. This will help other users with the same issue.

For a permanent fix so you don’t have to run unset http_proxy every time you start Cursor

  • If the variable is set in ~/.bashrc, ~/.profile, or /etc/environment, remove it from there if you don’t actually need a proxy.
  • If you need the proxy for other apps but not for Cursor, launch Cursor via a wrapper command: env -u http_proxy -u https_proxy cursor, or create a .desktop file with that command.
  • Also check https_proxy, HTTP_PROXY, HTTPS_PROXY, all_proxy. These can affect it too.

I’ll mark your post as the Solution so the thread shows as resolved.