i found no errors in the production log though, the web ui says it´s saved.
its a 2 day old gitlab 8.2.2 omnibus installation,
last change was ssl activation with a wildcard certificate.
update: as mentioned below a gitlab restart does show the new values, the misbehaviour is still in place though as changes are not applied until restart.
i just stumbled upon gitlab endpoint urls in the mattermost configuration wich are still http.
Maybe there are also some endpoints for the admin interface in gitlab wich still don’t have the https in place ?
I dont know where to look for those in configurations really though, dev tools network tab says everything is fine.