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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
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Seth Simmons
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ASKER

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.
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ASKER

I RAN repadmin /kcc it failed
 with error ds replication faile dwith error 8453
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ASKER

when I ran DCDIAG. test: check security error

it says unable to query list of connection failures