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DC replication issue

I'm having some replication issues due to RPC issues it appears. I'm not sure how to go about fixing it. Can somebody help? The following is a snipplet from a repadmin /replsum command generated on a DC. I've been looking at this https://support.microsoft.com/en-us/kb/2102154 but not gotten anywhere yet.. PortQry looked fine i thought for all the ports that were listed.

Help please

btw these 3 domain controllers I renamed in the snipplet for security purposes have the following operating systems
"1" - Server 2012 (not r2)
"2"  -Server 2012 (not r2)
"Server" - Server 2008 Std

"Server" and "1" are in the same site btw.. "2" is in it's own site
replication-issue-br2---Copy.JPG
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Will Szymkowski
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The RPC error is typically related to the follow issues.

- the dc is offline or not reachable via network
- the RPC service is not started or halted
- you have a firewall which is blocking communication

Most common issue are above.

Will.
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all DCs are online and reachable
RPC service on all DCs is automatic and started
all software firewalls are disabled/stopped via Group Policy
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I tried using the AD Replication Status Tool and it appears replications are occurring successfully...Even though the repadmin /replsum command states otherwise.... confused.... i guess i need to figure out where the RPC errors are initiating from... any ideas as to how to do that? who knows if i have a replication issue or not here due to the conflicting results shown in the screenshots
rep-issue-or-not.JPG
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Will Szymkowski
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Tried to do a Certificate Authority role on this DC and got this RPC server error message... RPC is causing all kinds of grief...
cert-request-error.JPG
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I've been trying to clean the logs up on this domain controller all day... yes i've rebooted it. AD sites and services looks fine... not sure what KCC connections are...
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maybe there is something wrong with Sites still... KCC error below

Event ID 1311 Also....


My connection objects in sites and services for the NTDS settings didn't autogenerate for 2 of my domain controllers. i had to manually add them.. might be another clue.. i manually made them just now...
KCC-error.JPG
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whatever the problem is has gone away overnight. i guess all the stuff i did yesterday helped after all. not sure what it is that fixed it though because i didnt document as i went
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led me to sites and services again to check that out, of which i had issues there.. maybe this was the issue.. unsure.. would like to know why those connections didnt autogenerate in the first place though in sites and services