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How long does DFS Replication take to establish a new connection?

Posted on 2009-02-19
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Last Modified: 2012-05-06
I have a 3 server replication group. Server1 contains the primary data and replicates with Server2 and Server3, but Server2 and Server3 do not replicate to each other. Server1 and Server2 are both within the same LAN while Server3 is located at a remote branch (WAN) connected via a private T1. Server1 completely crashes and needs to be removed from the group while a new server is configured. I create a 2 new connections between Server2 and Server3 so that they will replicate between each other. How long will it take before the new connections are established and begin to replicate?
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Question by:nohbusa
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by:nohbusa
ID: 23688705
Looks like it tried to establish a connection after about 30 minutes but failed (event viewer event number 5012). I will continue to monitor it and submit my findings.
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by:Donald Stewart
Donald Stewart earned 200 total points
ID: 23688706
from here  
 
http://technet.microsoft.com/en-us/library/cc736872.aspx


Initial replication does not begin immediately. The topology and DFS Replication settings must be replicated to all domain controllers, and each member in the replication group must poll its closest domain controller to obtain these settings. The amount of time this takes depends on Active Directory replication latency and the long polling interval (60 minutes) on each member.
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by:Donald Stewart
Donald Stewart earned 200 total points
ID: 23688722
DFS-R needs all members in the replica set to be consistent before this error will go away, and it's sometimes normal to see this event logged in the meantime.

If it's an established replication group, I'd recommend running a DFS-R health report via dfsmgmt.msc as it will tell you the exact connection object that is invalid, and you can them remove and recreate/readd the object back.
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nohbusa earned 0 total points
ID: 23688804
Ok, it appears that DFSR will attempt to establish the connection at intervals ranging from 10-20 minutes after the initial attempt (they seem to become progressively further apart). If the remote server does not yet recognize the changes the connection will not establish. To force the changes to the remote server type the following in a command prompt:
Dfsrdiag pollad /mem:<servername>
Obviously replace <servername> with the name of the remote server and it will update the changes that were made to DFSR. Then the next connection attempt should go through fine provided you have no other inhibiting factors specific to your environment.
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