Microsoft exchange 2010 client access role

how can I configure the client access roles array in Microsoft exchange 2010 so that it will not prompt the user id and password during the fail over.
jobby1Asked:
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seb_ackerCommented:
Hello
Nothing to confiugre : it should not ask anything ;)

What is your current configuration :
How many servers, their names and IPs, the CAS Array name, are other roles on the servers, are they under the same AD site (they should), and so on.
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AkhaterCommented:
CAS arrays are created when you have more than one CAS server in the same AD site they are created using the following

New-ClientAccessArray -FQDN CASName.domain.com -Name "CASName.domain.com"


You also need to add in your local DNS an A record for CASName.domain.com pointing to the NLB ip of your CAS servers
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jobby1Author Commented:
Do we need to configure NLB? How can we configure NLB for CAS.
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AkhaterCommented:
yes you need to do NLB for the CAS servers or else how can I share the same IP?

for NLB this is a video who will walk you through how to get start with it just follow the NLB part of it

Keep it unicast not multicast

http://www.youtube.com/watch?v=GLMZxin9n84&feature=youtube_gdata

also note you need 2 NIC on each CAS so the CAS servers should have a private network between each others for heartbeat

here is another tutorial covering it in details
http://blogs.kraftkennedy.com/index.php/2009/11/25/configuring-nlb-for-exchange-2010-cas-load-balancing/
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seb_ackerCommented:
Be carefull: Don't set any NLB if your CAS roles are on the same server than the Mailbox role. That's not supported.


that's also an article to the cas array configuration : http://www.msexchange.org/articles_tutorials/exchange-server-2007/planning-architecture/uncovering-new-rpc-client-access-service-exchange-2010-part1.html
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