This document explains how to get rid of the Cisco Unity Event viewer
error: "C:\WINNT\system32\dnsperf.dll" failed, which appears in the application
log of the Cisco Unity Server event viewer.
Note: This document contains information about how to modify the registry
in Microsoft Windows 2000 Server. Make sure to back up the registry before you
modify it. Make sure that you know how to restore the registry if a problem
Cisco recommends that you have knowledge of these topics:
The information in this document is based on these software and
The information in this document was created from the devices in a
specific lab environment. All of the devices used in this document started with
a cleared (default) configuration. If your network is live, make sure that you
understand the potential impact of any command.
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This error keeps appearing in the event viewer in the Cisco Unity
The Open Procedure for service "DNS" in DLL
"C:\WINNT\system32\dnsperf.dll" failed. Performance data for this service will
not be available. Status code returned is data DWORD 0.
This problem occurs due to the perflib errors with the DNS check. Use
the solution in this section in order to solve the problem.
Perform these steps in order to get rid of these errors in the
In order to completely remove a performance monitor extension,
first identify the service name of the product that supported the custom
In this case, the service name is DNS
Use RegEdt32.exe to traverse to the following
subkey from Start >
Select the Performance subkey, then click
Delete from the Edit menu.
This action deletes the Performance subkey and all
Delete the application log in the event viewer and reboot the Unity