Applies to: Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2007-04-17

When a user synchronizes a mobile device with Microsoft Exchange Server 2007, an HTTP response code is returned for each synchronization. The HTTP response code is determined by the success or failure of the synchronization. You can examine the HTTP response code to determine whether the synchronization request was successful. If the synchronization request was not successful, the HTTP code can indicate why the request failed. This topic lists the HTTP response codes and the meaning of each code.

Interpreting HTTP Response Codes

The following table lists the different HTTP response codes that can be returned when a device synchronizes with Exchange 2007. These response codes are displayed in the Microsoft Exchange ActiveSync protocol logs. Error codes are also displayed on the mobile device.

HTTP response codes

Code Description Meaning



Synchronization completed successfully.



The user is not authorized to synchronize with Microsoft Exchange.


Internal Server Error

An internal error occurred. This is frequently caused by network problems that prevent connection to the Exchange server.


Bad Request

The request was corrupted or incomplete.


Access Denied

Access to the Exchange server was denied. This is frequently caused by network connectivity problems.

For More Information

For more information about Exchange ActiveSync, see the following topics: