Gitlab on Ubuntu server - url not working

Hi guys, we have an Ubuntu with Gitlab.
One user complaining got 500 error. And rebooted the server.

Before rebooting the server, the https://192.168.1.50 was showing the Gitlab web page.

After rebooting, Gitlab web page is not showing up.

Nginx seems to be running.

I got these when I run sudo gitlab-ctl status

ok: run: gitaly: (pid 5392) 1s
ok: run: gitlab-monitor: (pid 5416) 0s
ok: run: gitlab-workhorse: (pid 5421) 1s
ok: run: logrotate: (pid 5431) 0s
ok: run: nginx: (pid 5512) 0s
ok: run: node-exporter: (pid 5520) 1s

I have tried restarting the service by:

sudo gitlab-ctl restart but still not working

Any ideas?

Thanks.