Event ID - 1805

Event Id1805
DescriptionRequest from user UserA@domain.com resulted in the Microsoft(R) Exchange back-end server <ServerName> returning an HTTP error with status code 403:Forbidden
Event Information"According to Microsoft:

This issue can occur if the Exchange virtual directory in Microsoft Internet Information Server (IIS) is configured to accept only Secure Sockets Layer (SSL) connections or if Integrated Windows authentication is not enabled on the Exchange virtual directory. With Exchange ActiveSync, this issue can occur if forms-based authentication is enabled on the Exchange Server.
Note If you are running Microsoft Small Business Server 2003, the resolutions in this article are automatically configured during Setup. If you are receiving the errors that are described in this article on Small Business Server 2003, try running the Configure E-Mail and Internet Connection Wizard. The wizard should help you reconfigure the Exchange virtual directory and forms-based authentication to work with Outlook Mobile Access and with Exchange ActiveSync.
To resolve this problem, use one of the following methods.
Method 1
Install and configure an Exchange Server 2003 computer as a front-end server.To do this view article number Q818467.
Method 2:
Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
Create a secondary virtual directory for Exchange that does not require SSL, and then add a registry value to point to the new virtual directory. You must use Internet Information Services (IIS) Manager to create this virtual directory for Exchange ActiveSync and Outlook Mobile Access to work. If you are using Windows Server 2003, follow these instructions:
Note These steps affect both Outlook Mobile Access connections and Exchange ActiveSync connections. After you follow these steps, both Outlook Mobile Access and Exchange ActiveSync connections us
Reference LinksExchange ActiveSync and Outlook Mobile Access errors occur when SSL or forms-based authentication is required for Exchange Server 2003

Q 818476:You can configure either Exchange Server 2003 Standard Edition or Exchange Server 2003 Enterprise Edition as a front-end server

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