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This article was previously published under Q250989
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When you are setting up a new connection agreement for the Active Directory Connector (ADC) on a Windows 2000 domain controller (DC) that is also running Exchange Server 5.5, you may receive the following error message:
The Microsoft Exchange specified on the Connections page is invalid. Enter a valid server name.
ID no c1031b9e
Microsoft Active Directory Connector Management.
Lightweight Directory Access Protocol (LDAP) is the protocol used by the ADC to communicate with Exchange Server. By default, the ADC tries to communicate with the Exchange Server directory by means of port 389 (the default LDAP port in Exchange Server). On a domain controller, Active Directory locks up port 389 as it starts, and the ADC cannot set up the connection agreement.
For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/224447/EN-US/ )XADM: How To Change LDAP Port Assignments in Exchange Server