Profiler conflicts


The .NET Common Language Runtime (CLR) only allows one profiler to access the profiling API of a process at any given time. If another profiler is installed on the system, the New Relic profiler will not instrument any applications.


To avoid a profiler conflict, fully remove the other profiler from the environment.

Exception: For conflicts with Microsoft's System Center Operations Manager (SCOM), follow the troubleshooting procedures specifically for SCOM.

1. Check for profiler conflicts.

To see if there are any profiler conflicts:

  1. Run Process Explorer as an Administrator.
  2. To find your app's process, right-click the app, then select Properties > Environment.
  3. Verify that the New Relic CLSIDs are included in the w3wp.exe, service, or non-IIS app environment details:

    • .NET agent version 2.9 or higher:

    • .NET agent version 2.8 or earlier:

2. Compare registry keys to Process Explorer if necessary.

If the conflicting profiler has been disabled and there is still an issue, compare the registry keys to the Process Explorer to see which profiler is present. On the machine where you are experiencing this issue, check the WAS and W3SVC REG for IIS apps, or check your service keys or non-IIS app keys.

To check registry keys with this... Do this...

If using Microsoft PowerShell, execute the following commands:

(Get-Item -Path HKLM:\SYSTEM\CurrentControlSet\services\WAS).GetValue("Environment")
(Get-Item -Path HKLM:\SYSTEM\CurrentControlSet\services\W3SVC).GetValue("Environment")
Command line

If using cmd, do the following for either WAS and W3SVC REG or for your service/non-IIS app. Here is an example for an IIS application:

  1. On the command line, enter regedit.
  2. From the Registry Editor, select HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Services.
  3. If applicable, select the WAS folder. From the WAS folder's list of registry keys, double-click Environment, and verify that New Relic's CLSIDs appear in the text box.
  4. If applicable, select the W3SVC folder. From the W3SVC folder's list of registry keys, double-click Environment, and verify that one of New Relic's CLSIDs appear in the text box.


Here are some commonly reported profiler conflicts. This is not an exhaustive list of .NET profilers, as any program that uses the .NET profiling API may cause conflicts with the New Relic .NET profiler.

Profiler name Profiler identifier
App Dynamics AppDynamics.AgentProfiler



Diagnostic Policy Service 555908D1-A6D7-4695-8E1E-26931D2012F4
IntelliTrace 2AA1AA98-2CAA-4FCF-86CE-EFA007737E83
Microsoft App Insights



SCOM APM AD5651A8-B5C8-46ca-A11B-E82AEC2B8E78

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