How to Monitor IIS Worker Process Crashes

If the App Pool crashes, detect an explicit root cause by following the below steps:

1. Install and set up the DebugDiag tool, available from this link:
   https://www.microsoft.com/en-us/download/details.aspx?id=58210
2. Open DebugDiag 2 Collection.

NOTE: If Select Rule Type dialog does not display, click Add Rule.

3. Ensure Crash is selected, and click Next. 

4. Select A specific IIS web application pool option and click Next.

5. Select DSP and click Next. 

6. Click Next on the Advanced Configuration (Optional) dialog without making changes.

7. Enter a name for the rule in the Type in a rule name box, or leave the default name.
8. Click the Browse button to select a location, or accept the default location. 

NOTE: This path is where the dump files are stored if the app pool crashes again:

9. Click Next.

10. Select the Activate the rule now option and click Finish.

Repeat these steps for the IIS worker process, w3wp.exe.

1. Open DebugDiag 2 Collection.

NOTE: If Select Rule Type dialog does not display, click Add Rule.

3. Ensure Crash is selected, and click Next. 

4. Select A specific process option and click Next.

5. Select w3wp.exe and click Next. 

6. Click Next on the Advanced Configuration (Optional) dialog without making changes.

7. Enter a name for the rule in the Type in a rule name box, or leave the default name.
8. Click the Browse button to select a location, or accept the default location. 

NOTE: This path is where the dump files are stored if the app pool crashes again:

9. Click Next.

10. Select the Activate the rule now option and click Finish.