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Multiple NICs, Multiple subnets, Exchange Server Active Sync

Posted on 2009-05-01
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Last Modified: 2012-08-14
I have an exchange 2003 server that has been operational for years and allows synchronization of email through PDAs (e.g. iPhone).  This has all worked marvelously until I added a second NIC on a separate subnet for the server.  We added a SAN device and I'm separating the ISCSI traffic for the SAN on the second card on its own subnet.  Both nics go to th same switch that has been segregated into VLANs.

The new card breaks only the Active Sync part of the exchange server.  Everthying else with email traffic works fine (sending, receiving, OWA, etc.)

I am thoroughly perplexed!
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Question by:ipmcinc
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by:Mestha
ID: 24283505
Dual homing Exchange can cause problems with Exchange.
ActiveSync makes an internal call between the ActiveSync directory and the /exchange directory. Therefore I suspect that something has happened there.
Ensure that the web site is set to listen on all IP addresses and that the correct DNS is being registered. If it is for a SAN it shouldn't have any DNS entry or default gateway set.

Simon.
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Author Comment

by:ipmcinc
ID: 24290186
Thank you for the ideas Simon.  Can you tell me the steps to take to check if the website is listening on all IP addresses?

As a bit of additional information too.  I have not yet moved the exchange database to the SAN.  All I have done at this point is used ISCI Initiator to connect the Exchange Server to the SAN and configured the new NIC card.  There is no default gateway set for the new nic.
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by:Mestha
ID: 24290231
Just bring up the properties of the web site, look at the IP address settings and ensure that it is set to all unassigned, rather than a specific IP address.

Simon.
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Author Comment

by:ipmcinc
ID: 24291009
Yup...that's what it's set to...still having the problem,...
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by:Mestha
ID: 24299967
I am not sure what else to suggest. It is almost certainly something to do with the way that the Microsoft-Server-ActiveSync directory makes its internal call to the Exchange virtual directory in IIS Manager.

Try a test account through the test site at Microsoft: https://testexchangeconnectivity.com/
See if that flags anything.

Simon.
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Accepted Solution

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ipmcinc earned 0 total points
ID: 24300017
I've just found the issue...it had to do with the NIC binding order.  The new card was being given a higher priority.
Go to the Network Connections folder
From the top menu choose Advanced --> Advanced Settings and reorder the bindings
The NIC for the ISCSI should have lower priority
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