Internal URL shown instead of external URL under rename repository in repository settings, change group path in group settings and change username in username settings
Enabled lines in my gitlab.rb:
external_url 'https://my.server.com/'
nginx['listen_port'] = 8888
nginx['listen_https'] = false
So for example, at the rename repository settings it displays:
http://127.0.0.1:8888/namespace/
instead of https://my.server.com/namespace/