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KCC Errors / Event ID 1865, 1311, 1566 - Active Directory

I have a single domain, multi site Active Directory setup and both remote Windows 2008 servers are full of Event ID 1865, 1311 and 1566 in the ADS logs.

All DC's are replicating fine (checked via NTDS) and I have modified the MTU to 1492 as I'm sure I have read on here somewhere and have rebooted the servers.

Can anyone advise on where  to go next?
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Mr_OCD
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Mr_OCD
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Glen KnightCommented:
OK, let's start first by running DCDIAG on all DC's, please post the results.

Do you have them all configured to use a valid Windows DNS server only?

Also, do you have all your Active Directory Sites and Services Sites and Subnets configured correctly?
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Mr_OCDAuthor Commented:
From running DCDIAG I can see we have replication errors between the two remote sites that are causing the problems.

I'm not sure how to post the results of the logs as they are quite long?

All DC's are configured to use valid Windows DNS servers only.

I have configured AD sites and services subnets, etc correctly but AD automatically generated the links itself.

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Glen KnightCommented:
Can you run the following:

DCDIAG > C:\DCDIAG-COMPUTERNAME.TXT

Replace the computername with the name of the server and then upload the text files.
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Mr_OCDAuthor Commented:
Ok here we go...

 DCDIAG-DRS.txt

*****************************************

 DCDIAG-STC.txt
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Glen KnightCommented:
And you have confirmed that both DC's are able to communicate with each other?

Can you run: dcdiag /test:connectivity

On both servers.  What are the results?
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Mr_OCDAuthor Commented:
Both servers pass connectivity tests.
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Glen KnightCommented:
Can you post the content of the errors you are receiving in the event log please?
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Mr_OCDAuthor Commented:
Event 1865:

KCC was unable to form a complete spanning tree network topology. As a result the following list of sites cannot be reached from the locate site.

Sites:
Remote Site 1

Event 1311:

KCC has detected problems with the following directory partition.

There is insufficient site connectivity information for the KCC to create a spanniong tree replication topology. Or, one or more directory servers with this directory partition are unable to replicate the directory information.

Event 1566:

All directory servers in the following site that can replicate the directory partition over this transport are currently unavailable.
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NavdeepCommented:
Hi,

How about you site links and site link bridging.

Do you have physically connectivity among all sites or it is it like hub - spoke topology.

Your site links should map you physical links. Please re verify site links
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Mr_OCDAuthor Commented:
All fixed.

Re-created the IPSEC VPN tunnel between the remote sites and all of the errors have stopped.
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Mr_OCDAuthor Commented:
None
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