2003 ADC can't see 5.5 box on port 389

Good afternoon, I have a client that is moving from 5.5 to 2003. Their 5.5 box had been set for LDAP to run on port 390, all was well. However when I load 2003 on a new member server and run everything through, the new 2003 box can't connect and move mailboxes from the 5.5 box. ADC says that

RE: 2003 ADC can't see 5.5 box on port 389

AM To: Exchange Discussions Subject: 2003 ADC can't see 5.5 box on port 389 Good afternoon, I have a client that is moving from 5.5 to 2003. Their 5.5 box had been set for LDAP to run on port 390, all was well. However when I load 2003 on a new member server and run everything