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itrezzo Technical Support Wiki

How to Configure itrezzoAgent Server for CAS Array



Exchange CAS (Client Access server) supports Outlook Web App, ActiveSync client applications, and POP3 and IMAP4 protocols. CAS provides access to free/busy data by using Availability service, enabling certain clients to download automatic configuration settings from Autodiscover service, perform offline Address Book download, and have Out-of-Office functionality.

Exchange CAS role accepts connections from software clients such as Outlook Express, Eudora POP3 or IMAP4 connections, hardware clients such as mobile phones that use ActiveSync, POP3, or IMAP4 to communicate with a Exchange server. There must be a Client Access server role in every Exchange organization and every Active Directory site that has the Mailbox server role installed.

To achieve redundancy and load balancing, Client Access Servers can be grouped into load-balanced and highly available groups called CAS arrays.



itrezzoAgent does not need or support CAS Array or load balancer. Load balancing can be achieved by pointing different itrezzoAgent servers to unique CAS servers. This can be done two different ways:

1. Using initialize itrezzoAgent wizard:
  • Open itrezzoAgent Administrator
  • Click on 'Action' Menu and Click 'Run Startup Wizard'
  • Initialize itrezzoAgent; window will open
  • Check 'Use Client Access Server (CAS)' checkbox

    print your CAS server's hostname or FQDN

  • Type in a CAS server's host name or FQDN, preferably the first CAS server
  • Enter multiple CAS servers (multiple CAS should be semi-colon delimited)
  • Click 'Next'-'Next'-'Finish' to complete the wizard
  • Reopen itrezzoAgent Administrator



2. Using Windows Registry Editor:
  • Create a String value 'CAS' (if it does not exist) in the following Windows registry path
    • HKEY_LOCAL_MACHINE\SOFTWARE\itrezzo\itrezzoAgent\CAS [32-bit Windows]
    • HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\itrezzo\itrezzoAgent\CAS [64-bit Windows]
  • Double-click CAS and populate that with your CAS Server Hostname of FQDN, or enter multiple CAS servers (multiple CAS should be semi-colon delimited string in registry value)
  • Reopen itrezzoAgent Administrator

print your CAS server's hostname or FQDN

print your CAS server's hostname or FQDN



Note: itrezzo does not need or support Exchange CAS load balancers or WAN optimizers. In some cases, a load balancer may cause issues with the EPS process. F5 is one such load balancer that is known to cause issues. Enter multiple CAS servers to increase availability. This will insure that if a single CAS is down for maintenance, another CAS will be used. If your organization has multiple itrezzoAgent servers, you can configure each itrezzoAgent with a different primary CAS to achieve a form of load balancing.


Using a WAN optimizer can cause contact corruption. Riverbed is one such vendor that is known to cause contact corruption. If you use WAN optimizers, please exclude IP addresses of all itrezzoAgent servers in WAN optimizers. If you need any assistance, please contact itrezzo technical support team

itrezzo Support Wiki version 3.0.5.619. See the itrezzo web site or the itrezzo blog site to learn about contact management on your smartphone.

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