/var/log/secure:

Jun 30 23:51:44 plesk sshd[497138]: Accepted password for blacksheep from 203.184.50.93 port 50674 ssh2
Jun 30 23:51:44 plesk sshd[497138]: pam_unix(sshd:session): session opened for user blacksheep by (uid=0)
Jun 30 23:51:44 plesk sshd[497138]: error: PAM: pam_open_session(): Cannot make/remove an entry for the specified session


/var/log/messages:

Jun 30 23:51:44 plesk pam_lve[497138]: Error Entering into CageFS -1 Invalid regexps: no match for path to base home directory