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Event ID: 1306 Source: MSExchangeDS

Source
Level
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.
Comments
 
As per Microsoft: "This behavior occurs because Windows 2000 Active Directory and Exchange Server 5.5 both use Lightweight Directory Access Protocol (LDAP) port 389 by default". See ME251196, ME241695 and ME260692 for details on fixing this issue.

See EventID 17 from source MSExchangeDS for additional information on this issue.
How to Change LDAP Port Assignments in Exchange Server (ME224447) is also useful.
We found that this event occurs when there is an attempt to run ILS services on Exchange servers. The conflict occurs because both applications are trying to use TCP port 389

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