Active Sync Cross-Site Redirection failure

Hi Team,

We have below Exchange Configuration

Sites - 2 sites (Active, Active)
DB copies - 2 copies in Site 1
                     1 copy in Site 2 (Remote passive)
2 sites have separate Internet facing with separate name spaces
a.mydomain.com
b.mydomain.com

Users mailboxes are distributed between 2 sites Exchange 2010 MBX servers.  

Due to capacity and performance issues, we are in position to move mailboxes and mount databases to the alternate sites.

When the mailboxes are activated in alternate site, OWA works fine by redirecting to home OWA URLs.  But mobile Activesync users having issues of not synchronizing the emails until they modify the OWA URL for the other site.

Why the mobile devices are not automatically configured when are moved/activated in the other site.  

Any suggestions for silent configuration for Active sync.

Thanks,
D
DINESHF1Asked:
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Simon Butler (Sembee)ConsultantCommented:
Have you read the proxy/redirection article at Microsoft?
https://technet.microsoft.com/en-us/library/bb310763(v=exchg.141).aspx
This is the key quote:

Exchange ActiveSync users who access an Internet-facing Client Access server in a different Active Directory site than the site that contains their mailbox can be redirected to the Client Access server in the same site as their Mailbox server if that Client Access server is Internet facing and if the client mobile phone or device has correctly implemented the redirection logic built in to the protocol that's used when communicating with Exchange 2007 and Exchange 2010.

The big bit there is at the end.
In my experience, most ActiveSync devices do not have the redirection logic built in, so you have to proxy the traffic instead. That means taking out the external URL on the second server so Exchange knows to proxy the traffic.

Simon.
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