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My Domain Controller with MSADC error ID:8026

Posted on 2008-10-28
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Last Modified: 2010-10-05
This happen every 5 mins in the event log and I have an Exchange2003 on other server.
I am not sure is it the problem of connections agreements?
Can anyone help me? thanks.

The error I listed as below:
Event Type:      Error
Event Source:      MSADC
Event Category:      LDAP Operations
Event ID:      8026
Date:            28/10/2008
Computer:      XXXXX
Description:
LDAP Bind was unsuccessful on directory XXXXfor distinguished name 'XXX\Administrator'. Directory returned error:[0x51] Server Down.   (Connection Agreement 'XXXXXXX' #5200)
For more information, click http://www.microsoft.com/contentredirect.asp.

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Question by:two_people_hk
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by:florin_s
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Hi,

Here are some tips for troubleshooting the problem.

Steve Gershman (Last update 7/19/2007):
In my case, this error occurred because the Exchange SRS service was not running. For some reason it did not start at boot time. I restarted the service and the error went away.

Mihai Andrei (Last update 11/28/2005):
As per Microsoft: "This problem can occur if the target server is down, if it is unreachable due to network problems, or if the Active Directory Connector (ADC) Service Account does not have permissions on the target server". See MSEX2K3DB for additional information about this event.

Jason Wilson (Last update 2/1/2005):
If the connection agreement has been moved to a E2k or E2k3 server, make sure that the LDAP port is set to 379 (instead of 389) and that the Site Replication Service is started.

Ionut Marin (Last update 4/27/2004):
See M288828 and M821828 for help on troubleshooting this problem.

Adrian Grigorof
Lightweight Directory Access Protocol (LDAP) allows you to query and manage directory information using a TCP/IP connection. Check network connectivity. Verify the user name, password, and port address are correct, and try again. If the problem persists, verify that the remote Exchange server is configured to support LDAP.

and here are the links to the comments above:

http://www.microsoft.com/technet/support/ee/transform.aspx?ProdName=Exchange&ProdVer=6.5.6940.0&EvtID=8026&EvtSrc=MSADC&LCID=1033
http://support.microsoft.com/default.aspx?scid=kb;en-us;288828
http://support.microsoft.com/default.aspx?scid=kb;en-us;821828
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by:two_people_hk
Comment Utility
Thanks I will take a look on it and have a try.
However I really want to know that does exchange 2003 needs to configurate connections agreements?
Thanks.
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Assisted Solution

by:florin_s
florin_s earned 100 total points
Comment Utility
Hi,

To better understand exchange I recommend "Implementing and Managing Microsoft Exchange 2003 Server"

and please see the following links:

http://support.microsoft.com/kb/281223
http://support.microsoft.com/kb/822921

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two_people_hk earned 0 total points
Comment Utility
It seems the error of connections agreements.
After I removed the agreement the problem solved.
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