NDTS KCC on domain Controller

We have 3 Sites around the country Connect by a VPN Link One of the Domain Comntroller is coming uo with error
vent Type:      Warning
Event Source:      NTDS KCC
Event Category:      Knowledge Consistency Checker
Event ID:      1925
Date:            3/31/2010
Time:            9:04:57 AM
User:            NT AUTHORITY\ANONYMOUS LOGON
Computer:      DC1
Description:
The attempt to establish a replication link for the following writable directory partition failed

User Action
Verify if the source domain controller is accessible or network connectivity is available.
 
Additional Data
Error value:
1722 The RPC server is unavailable
But if I type in nslookup the both controller I get
server name and ip address

What could the probelm be?

LVL 1
andrewh123Asked:
Who is Participating?
 
Mike ThomasConnect With a Mentor ConsultantCommented:
Check out this link for a possible resolution.

http://www.eventid.net/display.asp?eventid=1925&eventno=2447&source=NTDS KCC&phase=1
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imran786Connect With a Mentor Commented:
Event ID 1925 with the error message that DNS lookup failed, inbound repl of a directory partition has failed on the destination DC, and you must fix the DNS problem.

http://technet.microsoft.com/en-us/library/cc785014(WS.10).aspx
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iimtiazConnect With a Mentor Commented:
Check out the link connectivity between sites. That the RPC issue. Try to recreate KCC connections after deleting the old one. using command repadmin /kcc
This type of case had been earlier discussed in EE
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Windows/2000/Q_21827051.html 
Thanks
Iftikhar
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andrewh123Author Commented:
Cheers

I tried using Netdiag /fix on the domain controller
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AwinishConnect With a Mentor Commented:
Delete the conection object from ADSS & run repadmin /kcc *
It will generate connection object automatically to decide which site has to replicate to which site.
Its not an error, you can verify the site link & connection object created link to proper site with its subnets.
Run repadmin /syncall /A /E /P /d
if any error doesn't comes,it means replication is working fine between all the sites.
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