До манипуляций

[root@a3mg ~]# systemctl restart sshd.service
[root@a3mg ~]# systemctl status sshd.service -l
* sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2018-08-21 16:47:52 UTC; 4s ago
     Docs: man:sshd(8)
           man:sshd_config(5)
  Process: 629 ExecReload=/bin/kill -HUP $MAINPID (code=exited, status=0/SUCCESS)
 Main PID: 637 (sshd)
   CGroup: /system.slice/sshd.service
           `-637 /usr/sbin/sshd -D

Aug 21 16:47:52 a3mg systemd[1]: Starting OpenSSH server daemon...
Aug 21 16:47:52 a3mg sshd[637]: Server listening on 0.0.0.0 port 22.
Aug 21 16:47:52 a3mg sshd[637]: Server listening on :: port 22.
Aug 21 16:47:52 a3mg systemd[1]: Started OpenSSH server daemon.


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После манипуляций но до ребута

[root@a3mg ~]# systemctl restart sshd.service
[root@a3mg ~]# systemctl status sshd.service -l
* sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2018-08-21 18:39:06 UTC; 11s ago
     Docs: man:sshd(8)
           man:sshd_config(5)
 Main PID: 14639 (sshd)
   CGroup: /system.slice/sshd.service
           `-14639 /usr/sbin/sshd -D

Aug 21 18:39:06 a3mg systemd[1]: Starting OpenSSH server daemon...
Aug 21 18:39:06 a3mg sshd[14639]: Server listening on 0.0.0.0 port 22.
Aug 21 18:39:06 a3mg sshd[14639]: Server listening on :: port 22.
Aug 21 18:39:06 a3mg systemd[1]: Started OpenSSH server daemon.

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После манипуляций и ребута когда нормальное подключение не возможно

[root@a3mg ~]# systemctl restart sshd.service
[root@a3mg /]# systemctl status sshd.service -l
* sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2018-08-21 18:55:03 UTC; 14s ago
     Docs: man:sshd(8)
           man:sshd_config(5)
 Main PID: 491 (sshd)
   CGroup: /system.slice/sshd.service
           `-491 /usr/sbin/sshd -D

Aug 21 18:55:03 a3mg systemd[1]: Starting OpenSSH server daemon...
Aug 21 18:55:03 a3mg sshd[491]: Server listening on 0.0.0.0 port 22.
Aug 21 18:55:03 a3mg sshd[491]: Server listening on :: port 22.
Aug 21 18:55:03 a3mg systemd[1]: Started OpenSSH server daemon.