Morning techs/devs,

Quick one here; xeams on ws2012r2 ---> exchange 2013, , 5990 build, no config has changed.

All of a sudden periodically we are getting:

2018-07-13 11:50:33,402 ERROR connector.d - Unable to start SMTP server. Cannot bind to port 25/192.168.254.6

every 2 or 3 hours and having to restart the service.  It works for another 3 or so hours then fails again.

Logs show nothing more that that.   
netstat -abo shows xeams is running when we restart it then when it stops running netstat -abo no longer shows it in the list.

Nothing else is binded to 25..?

Would really appreciate your help on this one.   cheers.