502 error on POST

[PipingRockIT-cj]

We are having issue with our .net web app running in IIS where certain post functions are failing with a 502 gateway error and event viewer shows an error (A process serving application pool 'apppoolname' suffered a fatal communication error with the Windows Process Activation Service. The process id was '####'. The data field contains the error number.) We have determined the dd trace agent is causing the problem, as stopping the service or removing the trace agent completely stops the errors. I enabled debug and reviewed the logs but did not see anything that stood out.

[womackn]

I am experiencing the same issue with Trace Agent 2.52 (datadog-dotnet-apm-2.52.0-x64.msi). Upon deployment of our .Net application to IIS we receive a 502 error which last for 12-13 minutes before clearing up on its own. You can recycle the IIS app pool to bring the site back up immediately. However removing the trace agent eliminates the problem. I am unable to find any meaningful information in the event viewer or logs.