LDAP Error - 1216

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Hi everyone, I have 2 Windows 2008 Servers and 1 Windows 2003 Server, the one
Windows 2008 server and the 2003 are domain controllers and the second
Windows 2008 is an Exchange 2007 member server. I have followed the KB935834
article on "How to enable LDAP signing in Windows Server 2008" but I am
receiving the error below on my 2008 domain controller. The server that is
being reported in the errors is my 2008 Exchange server, I do get 1 or 2
error every once in a great while with the domain controllers own ip, and
these are the only LDAP errors being logged. I have turn up the logging to
try and diagnose the issue but only still receive this error so I have set it
back. How can I fix this?

Log Name: Directory Service
Source: Microsoft-Windows-ActiveDirectory_DomainService
Date: 2/22/2009 11:29:09 AM
Event ID: 1216
Task Category: LDAP Interface
Level: Warning
Keywords: Classic
User: N/A
Computer: myserver2008dc.mydomain.local
Description:
Internal event: An LDAP client connection was closed because of an error.

Client IP:
10.0.22.4:59675 ***(MY EXCHANGE SERVER)

Additional Data
Error value:
1236 The network connection was aborted by the local system.
Internal ID:
c0602f0
.



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