Concern Installation

hi everyone

i am new to do Installation procedure in NAV 2009 R2 when try to Installation it be Installed & server also Installed.i can access sever in Server PC it is Fine & working while i am going to End users to connect server it is not working & error is coming is Timeout Error
my server Config is Windows Server 07 R2
Can any one help me For my Problem

Thanks & Regards

Leeport