All Ports are open, the firewall doesn`t block any ports.
I tested to connect to other sql server and i was able to connect to all of them. Some of them are in the same subnet, some are not.
But connecting to the master-server isn`t allowed to any of my servers.
By using "telnet" i always get this message:
C:\User\name> telnet serverx.example.com
Connecting to serverx.example.com...unable to connect to host on port 23: Connection refused.
Could it be that there are other security settings except username and password?
Firewall and adding users in the master server can`t be the problem, I have tested it...