Access CAS Array Behind ISA 2006

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scott_k22792

Perhaps a question more for the ISA group but I am hoping the exchange guru's can help me. I am trying to access a CAS Array behind an ISA 2006 server. If I specify the NLB virtual IP in a ISA rule the site does not load from the internet. If I specify either of CAS array member servers specifically, the OWA page WILL load.
I was not aware there were any particular tricks to make isa work with a nlb array behind it. Internally the array and virtual ip work as expected.
Really hoping someone can shed some light on this.
Thanks!!
 
E

Ed Crowley [MVP]

I don't know why NLB wouldn't work behind ISA, but I strongly recommend that you create a server farm in ISA for the CAS servers and use that instead of connecting to the load-balanced address, because ISA's internal load-balancing mechanism is more robust than NLB.Ed Crowley MVP " There are seldom good technological solutions to behavioral problems."
 
B

Brian Day MCITP

CAS array is used for MAPI/RPC. What protocol are you trying to use?Microsoft Premier Field Engineer, Exchange
MCSA 2000/2003, CCNA
MCITP: Enterprise Messaging Administrator 2010
Former Microsoft MVP, Exchange Server
My posts are provided "AS IS" with no guarantees, no warranties, and they confer no rights.
 
S

scott_k22792

Im trying to connect to the OWA web interface from an external client, so https in this case. I understand that the cas array handles mapi and rpc for internal clients. But if the cas array does not handle https requests to the owa interface how do you provide a highly available OWA environment to clients outside of the network?
 
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scott_k22792

It seems I may have answered my own question in that in order to load balance incoming owa requests i need to do it at the isa level for http and https. I guess if I use a hardware load balancer i can solve all these problems in one.
 
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Brian Day MCITP

But if the cas array does not handle https requests to the owa interface how do you provide a highly available OWA environment to clients outside of the network?
A CAS Array is nothing more than a logical container in AD used by the RpcClientAccessServer attribute on databases and then referenced via the Outlook profile. It doesn't actively take place in the load balancing.

Your Windows NLB, or Hardware Load Balancer, or Web Farm within ISA are the items used for actually balancing the HTTPS or RPC traffic among the CAS servers you want to.

Microsoft Premier Field Engineer, Exchange
MCSA 2000/2003, CCNA
MCITP: Enterprise Messaging Administrator 2010
Former Microsoft MVP, Exchange Server
My posts are provided "AS IS" with no guarantees, no warranties, and they confer no rights.
 
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