Load Balancing Array DC 2003

Dear Experts,

We have created a load balancing array between two domain controllers DC01 and DC02 and we noticed that we are receiving the followng error from the replication partner DC03

Syncall reported the following errors:
Error contacting server CN=NTDS Settings,CN=DC01,CN=Servers,CN=Site1,CN=SItes,CN=Configuration,DC=domain,DC=com <network error):1722 (0x6ba): The RPC server is unavailable.

Error contacting server CN=NTDS Settings,CN=DC02,CN=Servers,CN=Site1,CN=SItes,CN=Configuration,DC=domain,DC=com <network error):1722 (0x6ba): The RPC server is unavailable.

Any thoughts?

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Mike KlineCommented:
AD is already fault tolerant by default DCs can all handle authentication requests.   You should need to load balance them in a cluster.



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syseng007Author Commented:
We did this because one of our critical application's authentication config setting can only accept IP add rather than domain add based.

Is there a way to fix this cosnidering the limitation we have? or we can safely ignore this issue?
Error "1722 (06xba): The RPC server is unavailable" is most likely there is a firewall that blocks the ports between the two DCs.  These are normally referring to as High Ports.  Please check out this article http://www.pbbergs.com/windows/articles/FirewallReplication.html.  We ran into this problem about 3 years ago.

Can you look at the log on your firewall to confirm this.
If you'd like to keep a critical application like that up, but want to retain hardware redundancy, consider virtual server host clustering of some form, and one or two DCs.  

Does your application only accept a single IP, then?
syseng007Author Commented:
Yes, our applicaton only accept a single IP....
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Windows Server 2003

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