Client can not connect to Server installed window server 2008 and using 8.8

HI all!

I have a problem when Client log in to server that installed window server 2008.It can not connect to this server even when restart and key in IP or Server name,...

I try disable Firewall of window 2008 in server machine and client can connect to server. But when i disable firewall, it's mean i can not use Remote desktop or terminal service..

Now, how i can do in order to solve this problem.

Thanks!