How to launch the X window via XManager?

[bangqianchen]

I have two servers, the last IP for the two server are 138 and 139. The 139 server is Redhat 6.2 and the 138 server is CentOS 7.
We can visit the 139 server in a GUI model by XManager, and the parameter configuration was as follow:
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We also can switch to 138 server by using ssh command. However, we can not visit the 138 server in a GUI model. I have try to configure this server by some tutorials such as modify the /etc/gdm/custom.conf files, but failed. Maybe they are not suitable for the CentOS 7.

I am a new bird, and any help is appreciated.

[TrevorH]

If you're trying to do this remotely then you'll almost certainly need to open the correct port(s) in the firewall using the firewall-cmd command.

[bangqianchen]

The 177 port already opened. Should I run any commands to show you some detailed information?

[aks]

If you're using the X11 protocol, the port is tcp/6000.

Regards