You might need to check whether some ports are open in an environment where Firewall are between servers.
Telnet is the tool to check the connectivity. Recently I was resolving one issue related to People search across multiple domains so I needed a tool to verify connectivity for ports 88, 139 and 445.
I used telnet to check, here is the command
telnet target_server_name_or_ip_address port_to_check
For example, log on to the server where you want to check connectivity from:
C:> telnet AD_SERVER_IP 88
There is another tool called PortQry that checks whether the port is listening or not, please visit http://support.microsoft.com/kb/816103
That's it.
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