ACTIVE DIRECTORY

I am having lot of windows 2008 and  2012 servers and they are lot of AD SITES

we are having problem with couple of servers with failed replication with error-8451 when I run repadmin /replsum

on destination server to check source server


what error means  and how can I solve problem
pramod1Asked:
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Seth SimmonsSr. Systems AdministratorCommented:
it means there is a database error
go to the resolution section for suggestions on how to troubleshoot

Troubleshooting AD Replication error 8451: The replication operation encountered a database error
https://support.microsoft.com/en-us/kb/2645996

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pramod1Author Commented:
when I went to event viewer:
it says below is this error can be linked

There is insufficient site connectivity information for the KCC to create a spanning tree replication topology. Or, one or more directory servers with this directory partition are unable to replicate the directory partition information. This is probably due to inaccessible directory servers.
pramod1Author Commented:
I RAN repadmin /kcc it failed
 with error ds replication faile dwith error 8453
pramod1Author Commented:
when I ran DCDIAG. test: check security error

it says unable to query list of connection failures
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