iPhones stopped connecting to Echange via 3g

We have about 20 iPhones in the company and yesterday all of them stopped connecting to Exchange via 3G. (Although they will still connect via wireless if the SSL is turned off.)  The Windows Mobile phones continue to work properly.  We have Exchange Enterprise 2003 on  Windows 2003 Standard Servers with a front-end, back-end configuration. So OWA sits on the front-end server and that's the address used when configuring email on phones. I've checked with our firewall guy and nothing was changed there. I've made no changes to the Exchange servers. AT&T and Apple deny any changes from their ends, any ideas? We've never had any problems with this connection.
akalichAsked:
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tharsternCommented:
Have you actually checked OWA is still working externally?

Have you checked any certificates haven't expired?

Have any exchange updates been applied recently?

Those are the first place I would look.

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Alan HardistyCo-OwnerCommented:
Please have a read through my Exchange 2003 / Activesync article which should allow you to check your IIS settings, run some tests and iron out any configuration issues that you may have:
http://www.experts-exchange.com/articles/Software/Server_Software/Email_Servers/Exchange/Exchange-2003-Activesync-Connection-Problems-FAQ.html
It should cost most scenarios that could go wrong, but it could be as simple as your SSL Certificate expired and needs renewing, as suggested above.
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akalichAuthor Commented:
I wish it was that simple.  The cert is good.  It was renewed about a month ago. But I just checked so I could confirm that to you. The odd this is that the situation only affects the iPhones, the Windows Mobile phones are fine.  I will check for updates, although I didn't do any manually and the server is set not to update on it's own. Will check the article noted above.
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Alan HardistyCo-OwnerCommented:
If the Windows Mobile phones work, the iPhones should also work - they use the same protocol (Activesync).
Download the Activesync Test App for the iPhone and see what that throws up.  Mentioned in my article and also downloadable via iTunes.
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akalichAuthor Commented:
Totally agree on the iPhone thing.  It's wierd. I've downloaded your article -- amazing, great info -- and am looking at the virutal dir config etc. I may be missing it, but I don't see if this info relates to a front-end exchange server, a back-end or both. Should I be making these changes to the front-end (OWA) or the back-end (mailboxes)?  Thanks.
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Alan HardistyCo-OwnerCommented:
The article is aimed at single-server environments as this is where I have my skill-set, so not exactly sure how much will be relevant, but hopefully a fair percentage will ; )
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akalichAuthor Commented:
The certificate when I look at it says it's fine and it's been installed for several weeks without problem, but the results of the Windows version of activesync says it cannot verify it. So I'm going to check with the issuer.  The cert details say it is fine too............... Also we have just discovered that the phones with the problems are 3G, and the 3Gs's are fine.
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Alan HardistyCo-OwnerCommented:
Perhaps an Upgrade is in order on the 3G phones via iTunes?
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akalichAuthor Commented:
While I still don't know why this happened...I have found a workaround. While on the phone with Apple (who was going to charge $700 for enterprise support) I decided to try something I figured wouldn't work -- but what the heck, I tried everything else.  I entered the MX IP in the server field... Voila...mail flows to iPhones again. Wierd.  Thank you for all the help, your FAQ sheet will be very handy in the near future when we setup new Exchange servers.  
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Alan HardistyCo-OwnerCommented:
That suggests a DNS issue causing you problems.

What has changed in DNS?

Glad you like my article : )
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