Moin,
I migrated my single server instance from a i386 architecture to a modern AMD64 by executing the steps mentioned in
So far I used "Unix user/group database" as Security Realm, with other words my local username and password.
While jenkins is operating perfect (and much faster) at the new server (even the executors are connected) I can not log in. No hint in the logfile /var/log/jenkins/jenkins.log.
Any hint how to keep going?