I found that a few Windows 2012 R2 server has sometimes this warning message "Too Many Communication Sessions Open - Unable to accept new connection". When it happens, I could not login or remote desktop to the server any more. I need to do a hard reset of the server. 

My NetXMS version is
Server 1.2.14
Agent: 1.2.17

Anyone has similar problem? How to fix it?

Any help is greatly appreciated!

Pedro