windows server 2016 datacenter, iis application pool stopped suddenly

Question

One of our web server iis application pool stopped suddenly and we have checked the event log and we found the below error and we want know the exact issue and how to fix the issue please go through the below error :An application has reported as being unhealthy. The worker process will now request a recycle. Reason given: An error message detailing the cause of this specific request failure can be found in the application event log of the web server. Please review this log entry to discover what caused this error to occur.

. The data is the error.

Answer 1

Hi @Surapally Sravan Kumar,

"An application has reported as being unhealthy. The worker process will now request a recycle."

This message is generated by IIS Health Monitoring, which automatically recycles the application pool if the worker process (w3wp.exe) is considered unresponsive or unhealthy. However, to determine the exact cause, we’ll need more specific information from the Event Viewer.

To help us investigate further, could you please:

1. Open Event Viewer on the affected server.
2. Navigate to:
   • Windows Logs > Application
   • Windows Logs > System Find the log entry that matches the time the Application Pool stopped.
3. Share the full details of the event, including:
   • Event ID
   • Source
   • Detailed description

This will help us understand whether the issue is related to IIS configuration, system-level behavior, or something that may need to be escalated.

In the meantime, here are some IIS-focused articles that explain how health monitoring and recycling work:

• Failure Settings for an Application Pool <failure>
• Troubleshoot Application Pool Crashes on Cloud Services
• Troubleshoot Failed Requests Using Tracing in IIS 8.5