Article ID: 224447 - View products that this article applies to.
This article was previously published under Q224447
When you attempt to start the LDAP Server Service for ports 389 and 636, after you install Exchange Server on a computer running Windows 2000, you may find the following Event IDs in the Application Event Log.
Event ID: 1306
Description: Register LDAP protocol failed with error 10048. If port number 389 is used by another application, change to an unused port, then shut down and restart Microsoft Exchange Directory Services. Contact Microsoft Support Service if condition persists.
Event ID: 1309
Description: Register LDAP SSL protocol failed with error 10048. The LDAP SSL server is not available. Make sure port number 636 is not used by another application.
Windows 2000 uses its own LDAP Server service which initializes prior to Exchange Server's LDAP Server service. This service uses Ports 389 and 636. When Exchange Server starts, the Exchange Directory attempts to initialize the same ports (for Secure Sockets Layer connectivity). The above stop errors are generated for this initialization failure.
Within the Exchange Administrator program, you have the ability to change the LDAP well-known port of 389 to another port that is currently not in use.
NOTE: Use caution when you select a new port number. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
150543This article lists many of the port numbers that Microsoft services use. For example, if you change the port number from 389 to 3389 and then install Microsoft Terminal Services, a Terminal Services client will be unable to connect to the computer that is running Termianl Services because Terminal Services listens on port 3389 by default.
(http://support.microsoft.com/kb/150543/EN-US/ )Windows NT, Terminal Server, and Microsoft Exchange Services Use TCP/IP Ports
To change the port assignment for the Exchange Server LDAP service:
To change the SSL port assignment for LDAP within Exchange Server, please refer to the following Knowledge Base article:
(http://support.microsoft.com/kb/232606/EN-US/ )XIMS: Exchange Server 5.5 LDAP Service Running on Windows 2000
Article ID: 224447 - Last Review: October 28, 2006 - Revision: 3.3