LDAP Port opening on Firewall

[Mahisri]

Help me please! I know the port 389 should be open for proper functioning of LDAP. I have case specific trouble - The Netscape directory server and Microsoft exchange server are differed by a firewall in between. The maintenance people complain that they could not replicate the directory entries correctly. What could be the problem? The port 389 is open. I doubt it is the problem with Servers configurations. Rgds Sridhar