/var/log/messages報錯 pam systemd(sshdsession) Failed to create session Connection timed out

PAM_LIMITS(CROND:SESSION): UNKNOWN LIMIT ITEM 'NOPROC'
現象：
pam_limits(crond:session): unknown limit item 'noproc'
處理：
把noproc改成nproc
 cat /etc/security/limits.conf
 #        - nproc - max number of processes 
* soft nproc 11000
* hard nproc 11000

pam_systemd(crond:session): Failed to create session: Input/output error