Microsoft.diagnosticshub.diagnostics.collectionstartfailedhubexception

Common failure scenarios include:

await diagnosticHubSession.StartCollectionAsync(targetProcessId); If the target process requires elevation

If the target process requires elevation, launch Visual Studio with admin rights ( Right-click → Run as administrator ). close other profilers

Delete temporary diagnostic files: %TEMP%\Microsoft Diagnostics Hub\ %LOCALAPPDATA%\Microsoft\VisualStudio\<version>\DiagnosticsHub\ If the target process requires elevation

| Aspect | Detail | |--------|--------| | Type | Developer-environment exception, not production code | | Primary source | Visual Studio Diagnostic Tools | | Meaning | Failed to begin collecting performance/debug data from a target process | | Most common fix | Run VS as admin, close other profilers, repair VS | | Inner exception significance | High – reveals actual system-level failure | This exception is a diagnostic failure of a diagnostic tool—an ironic but informative error that typically points to environment or permission issues rather than a bug in your application code.

Common failure scenarios include:

await diagnosticHubSession.StartCollectionAsync(targetProcessId);

If the target process requires elevation, launch Visual Studio with admin rights ( Right-click → Run as administrator ).

Delete temporary diagnostic files: %TEMP%\Microsoft Diagnostics Hub\ %LOCALAPPDATA%\Microsoft\VisualStudio\<version>\DiagnosticsHub\