Unable to synchronise with Microsoft Exchange 2003 / 2007 via GPRS / 3G connection - Server ActiveSync error code 0x8503001A

 

 

Symptoms

 

When synchronising from a Windows Mobile 5 or 6 device to Microsoft Exchange 2003 SP2 or 2007, synchronisation is successful via a WiFi or LAN connection, but when synchronising via a cellular connection (GPRS, 3G), error code 0x8503001A is returned.

 

 

Cause

 

Windows Mobile is not always compatible with the TCP compression mechanisms employed by some GSM network operators.

 

Resolution

 

Disable TCP compression.

On the Exchange server, launch the IIS Manager.

Right click on the entry for the server and select Properties. Tick the option to Enable Direct Metabase Edit

 

Click OK. Close the IIS Manager.

 

Browse to “C:\ Windows \ System32 \ InetSrv \ “ and locate the file named “metabase.xml”. Open the file with Notepad.

 

Scroll down to the section beginning:

 

<IIsWebVirtualDir           Location ="/LM/W3SVC/1/ROOT/Microsoft-Server-ActiveSync"

 

Locate the following two lines:

 

DoDynamicCompression="TRUE"

DoStaticCompression="TRUE"

 

Change TRUE to FALSE

 

Save the file.

 

Restart the IIS Admin Service.

 

 

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James Liddiard
Network Manager