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
RVFB ITAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
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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RVFB ITAuthor Commented:
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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RVFB ITAuthor Commented:
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 SzymkowskiSenior Solution ArchitectCommented:
Have you been able to try and reboot this domain controller? Also have you checked AD Sites and Services to see if there are any error present in there? Make sure that the appropriate KCC connections have been made to the DC's.

Also ensure that the logs are clean on this DC that is providing the issue.

Will.
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RVFB ITAuthor Commented:
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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RVFB ITAuthor Commented:
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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RVFB ITAuthor Commented:
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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RVFB ITAuthor Commented:
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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RVFB ITAuthor Commented:
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
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