MSExchange Availability 4016

 

This article provides an explanation and possible resolutions for a specific Exchange event. If you don't find what you’re looking for here, try searching Exchange 2010 Help.

Details

Product Name

Exchange

Product Version

14.0

Event ID

4016

Category

Availability Service

Symbolic Name

LogonAsNetworkServiceFailed

Message Text

Process %1: Unable to logon as network service context for proxying requests. Cross-site and cross-forests requests could fail because of this. Exception is %2.

Explanation

This Error event indicates that the Microsoft Exchange Availability service did not logon as a network service. The Exchange Availability service retrieves the Schedule+ Free Busy and Out-Of-Office (OOF) data for a set of mailboxes residing on a computer that is running Exchange Server 2007 or Exchange Server 2010. When the Exchange Availability service cannot directly connect to a mailbox that resides in a remote Active Directory forest, it sends a proxy Web request to another instance of the Exchange Availability service that is running in the remote Active Directory forest by using Kerberos authentication. If Kerberos authentication fails, Network LAN Manager (NTLM) authentication is used. Under NTLM authentication, the Web request for a cross-site or cross-forest Exchange Availability service that is running under the context of a local computer uses an Anonymous user account.

The cross-site or cross-forest Availability service cannot authenticate an incoming Web request that uses an Anonymous user account. Therefore, the cross-site or cross-forest Availability service must impersonate the network service context. This means that even under NTLM authentication, the Web request for cross-site or cross-forest Exchange Availability service uses a local computer account. This event is logged when the Exchange Availability service does not create the network service authentication context.

User Action

To resolve this error, contact Microsoft Product Support Services. For more information, visit the Microsoft Help and Support Web site.

For More Information

If you are not already doing so, consider running the Exchange tools, which have been created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues and improve mail flow. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.