Microsoft.diagnosticshub.diagnostics.collectionstartfailedhubexception -

Shut down other profilers, performance monitors, or secondary Visual Studio instances debugging the same process.

| 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. Shut down other profilers

Console.WriteLine($"Diagnostic collection failed: ex.Message"); if (ex.InnerException is UnauthorizedAccessException) Console.WriteLine("Try running Visual Studio as Administrator."); // Log to telemetry or retry with fallback configuration close other profilers

Common failure scenarios include:

await diagnosticHubSession.StartCollectionAsync(targetProcessId); Shut down other profilers