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Event ID: 1925 Source: NTSDKCC

The attempt to establish a replication link for the following
writable directory partition failed.

Directory partition:
Source domain controller:
CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=contoso,DC=com
Source domain controller address:
Intersite transport (if any):

This domain controller will be unable to replicate with the
source domain controller until this problem is corrected.  

User Action
Verify if the source domain controller is accessible or
network connectivity is available.

Additional Data
Error value:
<error code> <error description>
We had to open port on firewall for AD replication to work properly. See ME179442 for reference.
Error: "1753 There are no more endpoints available from the endpoint mapper." - No information

Error: "8524 The DSA operation is unable to proceed because of a DNS lookup failure." - Proceed with DNS testing as described in "Event ID 2087: DNS lookup failure caused replication to fail."

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