Exchange 2010 DAG - Client Access Issues

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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essexboy80Asked:
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David Paris VicenteSystems and Comunications  Administrator Commented:
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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tshearonCommented:
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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Adam FarageEnterprise ArchCommented:
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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essexboy80Author Commented:
This was resolved.

I did an Exchange Service Pack and this now works
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essexboy80Author Commented:
Found a Solution
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