[CentOS] sshd problem on reboot

Sat Jan 7 10:05:26 UTC 2017
Alessandro Baggi <alessandro.baggi at gmail.com>

Hi list,
I have a dedicated server managed  through ssh and this morning I have 
upgraded my system from 7.2 to 7.3. After yum finished his work, and 
rebooted my server.
After reboot I tried to log in with ssh and got "Connection refused". 
I've noticed that all public services were online.

So I've contacted my provider to get access to the server and I've 
noticed that ssh was started with my specified port. I've tried to log 
locally on server and I got connection refused. So I've ridden logs and got:

error: bind to port MYPORT in LOCALIP failed: cannot assign requested 

I've restarted sshd and problem "was solved".
Now I can't try to replicate this error because I can't reboot the server.

My addressing config is:

AddressFamily inet
ListenAddress LOCALIP
#ListenAddress ::

What can cause this problem?

Thanks in advance.