Solved

Outlook Web App

Posted on 2011-09-06
7
500 Views
Last Modified: 2012-05-12
Hello,

I should be very grateful if anyone can assist me.

My organisation currently has four Exchange servers, one front-end 2003 running Outlook Web Access in our DMZ, one back-end running 2003, and two 2010 servers in a DAG both running the Mailbox, Client Access, and Hub Transport roles.

I'm trying to setup Outlook Web App to work with the Exchange 2010 servers, and want to use one FQDN to access one server, and then the second, should the first one fail.  I've setup a cname entry in our DNS to redirect traffic sent to mail.domain name to server1.domain name, but how can I redirect traffic to server2 if necessary.

I've read a lot about Outlook Web App, but can't find any reference to using it with a DAG.

In addition, I know that in Exchange 2010 you shouldn't have a Client Access Server in the DMZ, but is there any problem having the Client Access Server and Mailbox Server running on the same machine?

0
Comment
Question by:vphul
  • 3
  • 3
7 Comments
 
LVL 8

Expert Comment

by:oldhammbc
Comment Utility
Hello,

To get the failover to work you will need to setup a client access server array. This basically sets up load balancing beweek both servers. Here is a guide on how to do it.. http://howtoexchange.wordpress.com/2009/12/16/configuring-client-access-array-for-exchange-2010-walkthrough/

In all honesty ive never setup a CAS array when the mailbox role is also present on the server but from what I can see there is no reason why it wouldnt work!!

Hope that helps!

Dave J
0
 
LVL 49

Accepted Solution

by:
Akhater earned 500 total points
Comment Utility
OK this might be a long post so sorry up front

1. CAS shouldn't be in the DMZ nor should be the front end but this is not the issue at hand
2. There is no issue at all having the CAS running on the mailbox server just some limitations (will get back to that in a while)
3. what you did is you added a CNAME, say name.domain.com pointing to one of your servers. If this servers fails you will need to updated the DNS to point that CNAME to the other server IP. in order to avoid time needed for replication lower the TTL of this record to something like 5 min.


DAG and OWA have nothing to do together the issue is that, if CAS are running on mailbox server in a DAG, you can no longer use windows load balancing for your CAS HA. so what you can do is

a. Get a hardware load balancer for your CAS load balancing
b. using DNS round robin (the case you exposed) but this will give you load balancing but not High Availability since, if a server fails, you need to manually change the DNS entries
0
 

Author Comment

by:vphul
Comment Utility
Many thanks oldhammbc and akhater.

I've now discovered that Outlook also uses CAS to connect to the mailboxes on an Exchange 2010 server, so though I've got a DAG, if the first server goes down, Outlook won't automatically connect to the second server, unless I create a CAS array using two other servers, or a hardware load balancer.

0
Free Trending Threat Insights Every Day

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

 

Author Comment

by:vphul
Comment Utility
Akhater,

Looking at the question "Outlook 2007 won't connect to 2nd Mailbox Server in a DAG", where you said "when one server fails you have to manually change the dns record for the cas", can I ask you to expand on this for me please.

Many thanks
0
 
LVL 49

Expert Comment

by:Akhater
Comment Utility
well first you need to create a cas array in all cases.

technically speaking a cas array is just a "virtual" name you give for outlook to connect to. no more no less

Now after you create this name, outlook will try to connect that name so in DNS that name should point to a specific IP address


1) you do a windows NLB for your CAS and you point the cas array name to the NLB ip, not possible if cas are on the mbx server in a DAG
2) you have a hardware load balancer and your point the cas array name to the load balancer IP address that will load balance the cas (great option but costly)
3) you create 2 DNS records in the DNS for the cas array name each pointing to one of your CAS servers. the draw back in that case is that, say server1 fails, dns server will not know and will still give its IP to clients so you will need, upon failure, to go to DNS and delete this record
0
 

Author Comment

by:vphul
Comment Utility
Many thanks for your help Akhater.
0
 
LVL 49

Expert Comment

by:Akhater
Comment Utility
no prob my pleasure
0

Featured Post

Why do Marketing keep bothering you?

Is your marketing department constantly asking for new email signature updates? Are they requesting a different design for every department? Do they need yet another banner added? Don’t let it get you down! There is an easy way to manage all of these requests...

Join & Write a Comment

Exchange server is not supported in any cloud-hosted platform (other than Azure with Azure Premium Storage).
Local Continuous Replication is a cost effective and quick way of backing up Exchange server data. The following article describes the steps required to configure Local Continuous Replication. Also, the article tells you how to restore from a backup…
To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates…
The video tutorial explains the basics of the Exchange server Database Availability groups. The components of this video include: 1. Automatic Failover 2. Failover Clustering 3. Active Manager

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now