My log is filing up with preauthentication failed, SSSD [KRB5_CHILD…
This seems to increase and then i lose connection to the server, both external access to SOGO and email.
Rebooting seems to fix the issue for a while.
I disabled fail2ban for a while and that seem to improve it but after a while would still require a reboot.
Kernel release 3.10.0-1160.66.1
Memory, swap and cpu all seem fine.