Cant connect client to computational server on RHEL7

I have a computational server with DS2016 running RHEL7 that I need to connect a client to. using change server dialoge on the client (on other machine and regardless of it OS (linux/win)) I typed the IP/host name of my linux server and got the following message:

Resolve host name Avicenna     OK      25.125.216.163
Ping location 25.125.216.163     OK     Packets: Sent = 1, Received = 1, Lost = 0 (0% loss)
Server version (https)                FAIL    Error getting server version

which means that the client can resolve and ping the host but not find DS server
I have another server running on windows 7, any client,however, can connect to it regardless of the OS of the client machine. I tried disabling the firewall on RHEL7 but no luck. 

any thoughts ??