Configuring Client Access Array for Exchange 2010 – Walkthrough

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Configuring Client Access Array for

Exchange 2010 Walkthrough

Posted by Chinthaka Shameera on December 16, 2009

In the previous post we configured the Database Availability Group of Exchange 2010. In this post I will

show you how to configure Exchange 2010 RPC Client Access Array. Previous Exchange versions (Exchange

2000/2003) did not support to the use the front-end server by internal MAPI clients. They were connected

directly to internal Back-End servers via MAPI over RPC. With the introduction of Exchange server 2007 this

limitation has decreased significantly. Client Access Server worked for most protocols except MAPI clients.

With Exchange Server 2010 all protocols should go through the Client Access Server and cannot connect to

Mailbox servers by MAPI clients directly. This has been done by introducing a new Client Access Server(CAS)

service known as the RPC Client Access service.

To configure Exchange Server 2010 CAS array, you should follow the five steps mentioned bellow.

1. You must configure internal DNS entry for the name of the CAS array. This name must be uniquefor the internal network.

2. You must configure Network Load Balancing. In this case i use Windows Network Load Balancingtechnology.

3. Create the new Client Access Array.4. Configure a mailbox database to use Cas Array5. Verify the Autodiscover services is working with CAS Array. (This step is optional, but it would be

good to verify this)


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Architecture of Clients connecting through a CAS array to a mailbox database

Step 1 Configure Internal DNS

1) Open DNS services manager in Administrative tools and add new aA Record(Host)for the Client

Access Server array. I used Client as CAS Array name and 200.200.201.120 as IP Address of CAS Array.

See figure 1.
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Figure 1

Step 2 Configure Network Load Balancing for the ClientAccess Server Array.

2.1) You must install Windows Network Load balancing feature in CAS servers, where you are supposed to

configure CAS array. Run below commend in Powershell. See figure 2 and 3.

Import-Module ServerManager

Add-WindowsFeature NLB

Figure 2: Running Import-Module ServerManager
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Feature 3: Running Add-WindowsFeature NLB

You will see the screen below after successful NLB installation. See figure 4.

Figure 4.

2.2) Start Network Load Balancing Manager by following Start / All Programs / Administrative Tools/

Network Load Balancing Manager. See figure 5.
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Figure 5: Network Load Balancing Manager.

2.3 ) Click Cluster > New to create a new NLB Cluster. In the Host section add Netbios name or ip address

of the first Client Access Server. In this scenario first CAS Netbios name is EX10-CAHT. Then click Next.

See figure 6.

Figure 6.

2.4) Here you can see the parameters of the NLB cluster. Leave it as default. Click Next. See figure 7.
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Figure 7: New Cluster: Host Parameters

2.5) Then you should add the IP Address of the CAS array. All clients should connect via this ip address and

you must give the IP Address that you added in DNS manager during A Recordcreation. In this scenario it

was 200.200.201.120. Then click ok and next. See figure 8.


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Figure 8: Adding IP Address for CAS Array.

2.6) In this screen you must add Full Internet Name and Select Cluster Operation Mode. Give the internal

FQDN for the Full Internet Name and Select Multicastas shown below. See Figure 9.


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Figure 9:- Adding FIN and selecting operating mode.

2.7) Then appears the Port Rules screen. Leave it as default. Click Finish. See figure 10.


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Figure 10: Port Rules.

2.6) At this point we have created a new NLB cluster. Then we must add the next Client Access Server(S) to

the NLB. Right click the cluster name and click Add Host to Cluster. In this scenario our second CAS server

is EX10-CAHT02. Then click Nextand Finish. See figure 11 and 12.


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Figure 11


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Figure 12: Adding Second nodes Netbios name.

Now you can see Windows NLB has been created. See Figure 13.


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Figure 13: NLB Manager

Step 3 Create Client Access Server Array

3.1) We dont have any pre-Created CAS arrays in this Organization. But would be better to check is there

are any pre-created CAS Arrays. Run below command. if you didnt create a CAS Array before, you will get

nothing . See figure 14.

Get-ClientAccessArray

Figure 14.

3.2) Then you should create new Client Access Array. Run below Cmdlet in EMS. See Figure 15.


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Figure 15: Creating new CAS Array.

Now we have finished creating an NLB and a CAS array. Then we must associate databases with this CAS

Array.

Step 4 Adding Mailbox Databases to Client Access ServerArray

Now we have come to the final step, that is need to add mailbox database to the Client access server array.

4.1) Use below CMDLet to add mailbox database to CAS array. Here we can add all mailbox databases at

once as shown as shown below. See Figure 16.

Get-MailboxDatabase | Set-MailboxDatabase -RPCClientAccessServer Client.msglab.local

Figure 16 : Adding MailBox databases to the CAS Array.


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Step 5 Configuring Outlook 2010 using Auto Discover

Now when Outlook connects to the Exchange Server, the CAS Array name Appears

as client.msglab.local.See figure 17.

Figure 17: Account Information of Outlook

You can see below actual connections made by Outlook. See figure 18.


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Figure 18: Connection Status

Note- Client Access Array is only used by MAPI Clients to connect MailBox ,Public Folders and

Active Directory only. You must use Windows NLB or another 3rd party NLB solution to load

balance Active Sync, AutoDiscover and Availability Services.

Documents

Configuring Client Access Array for Exchange 2010 – Walkthrough