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Bypass ISA proxy for Outlook Anywhere

Posted on 2014-10-24
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Last Modified: 2014-11-04
Have a network using ISA 2004 as a web proxy.  This is shortly to be removed.

In the meantime, the client has been migrated to a hosted Exchange service and ISA is blocking Outlook Anywhere connections.  I understand that ISA breaks the RPC-over-https protocol and needs to be bypassed, but how is this done?

I have removed the web proxy filter for all HTTPS but still not working
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Question by:devon-lad
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Expert Comment

by:Flora
ID: 40401253
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by:devon-lad
ID: 40401274
I think this is related to external clients and in-house Exchange.  Our situation is the other way round.
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by:Gareth Gudger
ID: 40403184
It may not be an ISA issue at all. It could be DNS related. Do you have any DNS records that are referencing autodiscover and pointing it to the ISA or the old Exchange server directly? Could be A, SRV or even an SCP. If not, may also need to create one if using split-DNS to point to the hosting service. Basically clients may be defaulted to an old internal environment.
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by:devon-lad
ID: 40406079
Gareth,

You may well be right.  We'd been having a lot of account lockout issues which were SCP related.  An I've just realised the test machines setup to bypass the proxy are using external DNS.  The red herring is that one internal machine using internal DNS does not have a problem.

Going to remove Exchange today, so will see if that solves it.
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by:Gareth Gudger
ID: 40406848
Awesome. That will likely be the final fix.
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devon-lad earned 0 total points
ID: 40412829
Turns out it was proxy settings being applied by a group policy to most but not all workstations.

They have the same internal and external domain name and most of the workstations were set to bypass the proxy for all traffic to *.companydomain.com.  Changed this to the specific internal web hosts used and Outlook started working.
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by:Gareth Gudger
ID: 40414562
Awesome. Be sure to accept your own comment as the solution.
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by:devon-lad
ID: 40421143
Found own solution
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