Active Sync proxying not works in a Exchange 2010/2007 Coexistence

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We have the following Configuration on our Exchange 2010/2007 Coexistence Infrastructure:

2 x Exchange 2007 CAS/HUB Servers (Hardware LB

2 x Exchange 2010 SP1 CAS/HUB Servers (Hardware LB

1 x Exchange 2007 CCR Cluster

2 x Exchange 2010 SP1 DAG Members

Synchronising EAS Devices via CAS1 2010 works, the devices can do proxy or redirect to CAS1 2007 or CAS2 2007 for Mailboxes on 2007 CCR Cluster.

Synchronising EAS Devices via CAS2 2010 does not work, no proxy or redirect is possible. Both the Servers CAS1 2010 and CAS2 2010 have the same EAS and IIS configuration.

CAS 2010 Servers Microsoft-Server-ActiveSync URLs:

InternalUrl :

ExternalUrl :

CAS 2007 Servers Microsoft-Server-ActiveSync URLs::

InternalUrl :

ExternalUrl :

IIS Logs on CAS1 2010 generate the following error:

2010-10-22 11:58:27 POST /Microsoft-Server-ActiveSync/default.eas User=ex2010test&DeviceId=Appl7S0396LLA4S&DeviceType=iPhone&Cmd=Sync&Log=PrxTo:eek:ldmail.domain.ch_LdapC1_Error:ConnectFailure_Mbx:ex2007ccr.domain.ch_Budget:(D)Conn%3a1%2cHangingConn%3a0%2cAD%3a%24null%2f%24null%2f0%25%2cCAS%3a%24null%2f%24null%2f0%25%2cAB%3a%24null%2f%24null%2f0%25%2cRPC%3a%24null%2f%24null%2f0%25%2cFC%3a%24null%2f0%2cPolicy%3aDefaultThrottlingPolicy%5Fbfadef95-5b87-4e1a-9eb1-52f3f6197b54%2cNorm_ 443\ex2010test 130.92.x.x Apple-iPhone3C1/802.117 500 0 0 42089

Does anyone has an Idea?

Thanks for any Help, fgeo-ch


I solved the Problem by reinstalling RU1 for Exchange 2010 SP1 on the CAS1 2010 box!
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