I have a DC that keeps getting orphaned from the domain. This happened back in October of 07. I finally got it rejoined after going through removing all the lingering objects, etc, and now it has happend again.
I am running a port scan from the orphaned server to its closest neighborhood DC. Here are the results.
==== End of RPC Endpoint Mapper query response ====
TCP port 137 (netbios-ns service): NOT LISTENING
TCP port 139 (netbios-ssn service): LISTENING
TCP port 445 (microsoft-ds service): LISTENING
TCP port 389 (ldap service): LISTENING
Using ephemeral source port
Sending LDAP query to TCP port 389...
It hangs on sending a LDAP query to TCP port 389 to its neighbor DC.
To me, this is a firewall port block issue. Any ideas?