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Exchange 2010 DAG - Client Access Issues

Posted on 2014-09-08
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Last Modified: 2015-05-05
Hi All,

I wondered if you could please help.

My setup is as follows:

Production Site

Exchange 2010 SP3 Database Server [EXCHDB01]
Exchange 2010 SP3 CAS Server 1 [EXCHCAS01]
Exchange 2010 SP3 CAS Server 2 [EXCHCAS02]

We are using an RPC CAS Array in this site called: OUTLOOK and we are using Microsoft Network Load Balancing.

This we will call Site A and it is on 192.168.1.0 /24

DR Site

Exchange 2010 SP3 Database Server [EXCHDB01-DR]
Exchange 2010 SP3 CAS Server 1 [EXCHCAS01-DR]

We are using an RPC CAS Array in this site called: OUTLOOK-DR and we are using Microsoft Network Load Balancing.

This we will call Site B and it is on 192.168.254.0 /24

So my issue is that if we failover the databases to the DR Site they mount fine, but none of the Clients in Site A can access the mailboxes. The same happens if we take the production mailbox and cas servers offline.

Can someone please offer me some urgent assistance.

Thanks

Paul
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Question by:essexboy80
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Expert Comment

by:David Paris Vicente
ID: 40310167
Probably you are missing some steps.

I advise you to look here How to Exchange 2010 Cross Site DAG Disaster Recovery.

Let us know if helped.
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Expert Comment

by:tshearon
ID: 40310409
You may want to make sure your DR CAS array is set to your production site (Outlook). That is porobably in the article posted by David.
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Expert Comment

by:Adam Farage
ID: 40311234
So.. David's comment is correct for this response...

The same happens if we take the production mailbox and cas servers offline.

The problem here is that you need to change the DNS A and MX records to point to DR. Once that is done and propagated, you are set.

This is where I am confused, and need clarification from you on..

So my issue is that if we failover the databases to the DR Site they mount fine, but none of the Clients in Site A can access the mailboxes.

Are the Client Access servers online in the primary site while the databases are active in DR? If that is the case, then you have a problem we should work on.. because technically it should proxy / redirect the connection to DR. You do have A records published for the CAS services ExternalURL right? Same with the InternalURL? For example webmail-dr.company.com (lets say is the External and Internal URL for OWA in DR) has a valid A record in private / public DNS?
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essexboy80 earned 0 total points
ID: 40753092
This was resolved.

I did an Exchange Service Pack and this now works
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Author Closing Comment

by:essexboy80
ID: 40759743
Found a Solution
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