| Event Id | 1309 |
| Source | MSExchangeDS |
| Description | Register LDAP SSL protocol failed with <error>. The LDAP SSL server is not available. Make sure port number 636 is not used by another application. |
| Event Information | According to Microsoft: CAUSE 1: Windows 2000 uses its own LDAP Server service which initializes prior to Exchange Servers 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. RESOLUTION : configure Microsoft Exchange to use a different port, allowing the ILS to use TCP port 389. The Add User Wizard can query Exchange on the alternate port. To change the port assignment for the Exchange Server LDAP service: 1. Start the Exchange Server Administrator program. 2. To change LDAP port assignments for all servers within the Site, make the following changes: a. Expand on Site Name\Configuration\Protocols\LDAP (Directory) Site Defaults object. b. Change the port assignment from 389 to a port which is currently not in use. This can be done by going to a command prompt, and typing the following command:netstat -an This command will display all active ports that are listening on all interfaces. Choose a port number that does not conflict with any of those ports that are in use. c. Click OK, stop, and restart the Exchange Directory service. Now all servers within the site will listen for LDAP requests on the newly assigned port. This requires Use site defaults for all properties to be selected for the LDAP protocol on each of the servers within the site. 3. To change LDAP port assignments for individual servers within the Site, make the following changes: a. Expand on Site Name\Configuration\Servers\Protocols\LDAP (Directory) Settings object. b. Change the port assignment from 389 to a port which is currently not in use. This can be done by going to a command prompt, and typing the following command:netstat -an This command will display all active ports that are listening on all interfaces. Choose a port |
| Reference Links | ILS May Cause SBS Wizards Not to Work How to Change LDAP Port Assignments in Exchange Server Exchange Protocols Fail After Applying Windows NT 4.0 SP4 |
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