GitLab EE throws Error 500 when accessed from external via URL, internal via IP all fine

Hi there,

today I experienced an Error 500 from my GitLab EE instance. Never seen this before. So first thing I did was a update of the gitlab-ee package because i knew it was pending, but nothing changed. Several “gitlab-ctl reconfigure” later: still same behavior, fails from external with Error 500. Ports 80, 443, 22 are open on Firewall. From internal I can access the instance and projects etc all fine through the internal IP. I have no clue what this could be and how to trace it, “gitlab-ctl tail” did not lead me to something useful. I get a request ID in the error response, where would I go about searching for it in the logs? Any idea how I could go about it?

Thank you!