Call tracing is Enabled

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at]  

Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine whether Call Trace logging is enabled:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\Disable Call Tracing

If the Exchange Server Analyzer finds that the registry value for Disable Call Tracing is present and configured with a value of 0, the Exchange Server Analyzer displays a non-default configuration message.

When Call Trace logging is enabled, function call data for the Store.exe processes is logged. Call Trace logging can cause a performance decrease of up to 4 percent. You should enable it only when you need it to troubleshoot slow or unresponsive Store.exe processes.


This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.

To revert to the default configuration

  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\System\CurrentControlSet\Services\MSExchangeIS\ParametersSystem

  3. Set the Disable Call Tracing registry value to 1. The Flush Call Traces key, RPC Requests Threshold key, and Call Tracing Logging Interval keys are not used when Call Tracing is disabled.

  4. Close the registry editor, and restart the Exchange server for the change to take effect.

Before you edit the registry, and for information about how to edit the registry, see the Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows Registry" (