|Message:||Anonymous Request received from HostAddress:”%1″, HostName:”%2″. Invalid Autodiscover site configuration. To fix the problem remove Anonymous access.|
This Error event indicates that the Microsoft® Exchange Autodiscover service was unable to process anonymous requests from an Autodiscover client, for example, an Outlook® client. An invalid Autodiscover site configuration and an anonymous client request could cause this error. ‘HostName’ in the error message text refers to the Domain Name System (DNS) name of the remote client.
Autodiscover requires authenticated clients to connect by using either of these methods:
We do not recommend that you enable anonymous authentication as this will give spammers access to e-mail addresses. A HTTP 403 error is sent to the client.
To resolve this error, do the following:
For more information about the Autodiscover service, see Managing Autodiscover.
If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.