Article ID: 927467 - Last Review: November 10, 2011 - Revision: 2.1

Error message when you use ActiveSync to synchronize a Windows Mobile-based device to Exchange 2003: "0x85030027 -- The Exchange Server requires certificates to log on"

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SYMPTOMS

When you use ActiveSync to synchronize a Microsoft Windows Mobile-based mobile device to Microsoft Exchange Server 2003, you receive the following error message:

0x85030027 -- The Exchange Server requires certificates to log on. Connect your device to your PC on the corporate network to obtain a certificate.

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CAUSE

This problem occurs if the following conditions are true:

You have not enabled certificate-based authentication for Exchange ActiveSync.
The Ignore Client Certificates option under the Client certificates setting is not enabled in the Iisadmpwd virtual directory.

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RESOLUTION

To resolve this problem, configure the Client certificates setting in the Iisadmpwd virtual directory to Ignore client certificates. To do this, follow these steps:

Start Internet Information Services (IIS) Manager.
Expand Server_Name (local computer), expand Web Sites, and then expand Default Web Site.
Right-click Iisadmpwd, and then click Properties.
On the Directory Security tab, click Edit under Secure Communications.
Under Client certificates, click Ignore client certificates, and then click OK two times.