Topic Last Modified: 2006-02-13

The Microsoft® Exchange Server Analyzer Tool includes a performance data collection engine that is used to query performance counter objects on computers that are running Exchange 2000 Server or Exchange Server 2003. The performance data collection engine collects data from the Bytes Total/sec performance counter of the Network Interface performance object to analyze performance data.

The Bytes Total/sec performance counter shows the rate at which the network adapter is processing data bytes. This counter includes all application and file data, in addition to protocol information, such as packet headers. The Bytes Total/sec performance counter is the sum of the Network Interface\Bytes Received/sec and Network Interface/Bytes Sent/sec.

The Exchange Server Analyzer reports the maximum value for the performance counter during the collection interval. For a 100 megabits per second (Mbps) network adapter, the value of the Bytes Total/sec performance counter should be under 7 megabytes/second. For a 1000 Mbps network adapter, the value of the Bytes Total/sec performance counter should be under 70 megabytes/second. If Bytes Total/sec exceeds 7 percent of the bandwidth of the network, the Exchange Server Analyzer displays an error.

This error usually indicates that the server is experiencing periods of unresponsiveness, causing mail flow to slow down or stop. Additionally, Microsoft Outlook® clients who connect to this server may receive the RPC cancel Request dialog box.

The following are some of the possible causes of this error:

To resolve this error,