DC no longer replicating 1 way only
Posted on 2011-05-04
we have a very strange issue at a customer’s location with replication of their DC. last night they stopped replicating. Below is the setup:
1 2008 R2 server which is a DC and GC. This also has Exchange 2010 installed on it.
1 2008 R2 server which is a DC and GC.
There are VPNs from A - B and i can ping each server from each location. By name (including FQDN) and IP. All traffic over the VPN both ways is permitted.
When i access AD sites and services from ServerA and try to pull replication from ServerB to ServerA i get the error message saying the RPC server is unavailable.
When i try to pull from ServerB in SiteB it reports a success.
When i log into ServerB and open AD sites and services and do the exact same as above i get success for both.
In the event log on ServerA we are receiving DFS and AD replication errors which are saying that the RPC server is unavailable to connect to ServerB. so i did some testing:
1. I can ping by name ServerB from ServerA and this would also append the DNS domain suffix.
2. I can ping by name ServerA from ServerB and this also would append the DNS suffix.
This is where it gets strange...
From ServerB i can access and see the shares/printers on ServerA by typing "\\ServerA" from the run box.
From ServerA i CAN'T access the shares when typing "\\ServerB". It says the path or server cannot be found.
However, when i use the IP address "\\192.168.2.200" it works fine and the shares and printers are displayed.
This now leads me to think that this is the issue. Why would the server not be able to access the shares using the name or the FQDN of ServerB from ServerA if it CAN access using IP address?
If it was something on the firewall it would not allow me to access using the IP as it would just block the ports. Also the firewall does not block packets based on name?
All windows firewalls are disabled on both servers and there are no AV or third party software installed.
If someone can point me in the right direction to help troubleshoot this further that would be most appreciated.