Microsoft KB Archive/311830

= XCCC: Error Message: Synchronization Failed Due to an Error on the Server. Try Again. HTTP_500 =

PSS ID Number: 311830

Article Last Modified on 8/18/2003

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The information in this article applies to:


 * Microsoft Mobile Information Server 2002

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This article was previously published under Q311830



SYMPTOMS
When you use the Server ActiveSync component of Microsoft Mobile Information Server to attempt to synchronize the Inbox, Calendar, or Contacts on your mobile device with your Exchange server, you may receive the following error message on the device:

Synchronization failed due to an error on the server. Try again.

HTTP_500



CAUSE
This issue can occur if the Exchange virtual directory on the Exchange server is not configured with Integrated Windows Authentication. The Server ActiveSync component uses Kerberos authentication when communicating with the Exchange server. If the Exchange server is not configured with Integrated Windows Authentication, the Exchange server returns a 401 error to the Server ActiveSync server, and then the Server ActiveSync server returns an error 500 to the device.



RESOLUTION
To resolve this issue, enable Integrated Windows Authentication on the Exchange virtual root:
 * 1) Start Exchange System Manager.
 * 2) Expand Servers, expand Server Name, and then expand Protocols. Expand HTTP, and then expand Exchange Virtual Server.
 * 3) Right-click Exchange, and then click Properties.
 * 4) Click the Access tab, click Authentication, and then click to select the Integrated Windows Authentication check box.
 * 5) Click OK, and then click OK again.



MORE INFORMATION
This issue also occurs if New Technology Lan Manager (NTLM) is turned on, but Kerberos is disabled. For additional information about how to disable Kerberos, click the article number below to view the article in the Microsoft Knowledge Base:

215383 How to Ensure Windows Integrated Logons in IIS 5.0

To reenable Kerberos, run the following command while in the Inetpub\AdminScripts folder:

cscript adsutil set w3svc/NTAuthenticationProviders &quot;Negotiate,NTLM&quot;

Keywords: kberrmsg kbprb KB311830

Technology: kbMobileInfoServ2002 kbMobileInfoServSearch

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