Merge branch 'fzimmer-master-patch-94106' into 'master'

Added question about secondary login

Closes #250686

See merge request gitlab-org/gitlab!43273

doc/administration/geo/replication/faq.md

@@ -67,3 +67,7 @@ That's totally fine. We use HTTP(s) to fetch repository changes from the **prima
 ## Is this possible to set up a Docker Registry for a **secondary** node that mirrors the one on the **primary** node?
 
 Yes. See [Docker Registry for a **secondary** node](docker_registry.md).
+
+## Can I login to a secondary node?
+
+Yes, but secondary nodes receive all authentication data (like user accounts and logins) from the primary instance. This means you will be re-directed to the primary for authentication and routed back afterwards.