Knowledge Base

XCON: Mad.exe Reaches 100% After You Recalculate Routing

Article ID: 182318

Article Last Modified on 10/28/2006

Microsoft Exchange Server 5.0 Standard Edition

This article was previously published under Q182318

SYMPTOMS

When you click the Recalculate Routing button on the Routing tab of the Site Addressing property page in the Microsoft Exchange Administrator program to recalculate the routing on Exchange Server 5.0, the Mad.exe process may use 100 percent of the CPU.

In the Windows NT Performance Monitor, you will see that the % Processor Time for the MAD process goes to 100 percent and does not drop from this figure even when left for 24 hours.

CAUSE

The message transfer agent (MTA) has hit a loop in the routing recalculation code.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.0

A supported fix is now available, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.

Keywords: kbqfe kbhotfixserver kbbug kbfix KB182318