Windows Phone 8 no longer connects to Corporate Exchange using Wifi provided by Router, which is connected to SBS 2011 box

Our company uses SBS 2011 and we have 2 Nokia Lumia 920 phones connected to our internal corporate wifi router to access the Exchange emails and to be able to browse the internet using wifi.

Everything was working fine with the phones until we had an issue with the server losing its settings (still not sure why that happened).  I re-ran the SBS 'Fix Internet' wizard which got the server working again.  

Now the phones can't connect to Exchange to get email through the wifi provided by the router.  If we disable wifi and use 4G, it finds exchange fine and downloads the email.

My thoughts are either it's one of these issues:
1. The self-signed certificate was re-generated on SBS and is now not matching what is set up on the Windows Phone.

2. The DNS is missing a record which would help the phones locate the Exchange server from inside the network .  However, the workstations that use the Outlook client on the same network (but not through wifi) can find Exchange fine.  So it is specific to the wifi router and the SBS 2011 box and the phones...

I have no idea how to isolate the issue or how to fix it.  I thought if I could add another DNS rule (as a workaround) which would help the phones locate the Exchange box from the inside, that might be a quick fix and confirm the issue is related to a DNS issue.  But I'm not sure how and where to do that in the DNS settings.  Would it be a forwarding rule, a reverse lookup rule etc.

Help!
elmbrookAsked:
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Alan HardistyCo-OwnerCommented:
It's a DNS issue where the phones can't resolve the public FQDN internally, so you just need to setup DNS to resolve the Public FQDN internally and the phones should be fine.

Glen wrote an article to help solve this sort of problem which can be found here:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_3703-Use-iPhone-on-wifi-network-without-the-need-to-reconfigure.html

Alan
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Alan HardistyCo-OwnerCommented:
Glad that I could help you solve your problem.

Can you let me know if there was any way that I could have improved my answer so that I would warrant an A grade, which you seem to give out to 95% of your other questions?

Alan
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elmbrookAuthor Commented:
Hi Alan,

Actually it was a mistake on my part, I should have awarded you the A grade.  I tried the DNS solution and at first it didn't work, but I accepted the answer as it showed me how to set up the DNS record from scratch.  Afterwards I realized the Windows phone had a mail.domain.com, I removed the mail portion of the DNS address and the phones then worked.

I'm not sure how and if I can change the Grade I assigned.  Let me know, but please accept my apologies.

Thanks
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Alan HardistyCo-OwnerCommented:
Not a problem - was just curious if I could have improved things.  I'll ask a friendly Mod to pop by.

Either way - glad it helped solve your issue.

Many thanks

Alan
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