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We use ISA 2006 to publish two Exchange 2007 CAS Servers. Both CAS Servers have identical hardware spec, and ISA Server connectivity verifiers report the same respons time from the servers.

The internal site name for the publishing rules are set to "excas.domain.com" which is mapped to the IP address of one of the CAS Servers (this is per technet documentation).

I'm using source IP for load balancing.

I notice that although failover and everything works, in regular production one of the servers handle around 90% of the connections. Is this usual?

Any pointers on how to investigate this would be deeply appreciated.

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Do sessions come from the same source IP ? They may be behind a NAT. –  plodoc Mar 21 '12 at 14:48

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