HTTP Error 503. The service is unavailable. App pool stops on accessing website

Question

There are number of posts on this and I have tried many a things by now. But to no avail. Myself a Winforms Developer basically, started working on this Web stuff few days b

Answer 1

If you have McAfee HIPS and if you see the following error in event viewer application log:

The Module DLL C:\Windows\System32\inetsrv\HipIISEngineStub.dll failed to load.
The data is the error.

Then the following resolved the issue in my case: https://kc.mcafee.com/corporate/index?page=content&id=KB72677&actp=LIST

Quote from the page:

1. Click Start, Run, type explorer and click OK.
2. Navigate to: %windir%\system32\inetsrv\config
3. Open the file applicationHost.config as Administrator for editing in Notepad.

4. Edit the section and remove the following line:
   

5. Edit the section and remove the following line:
   

6. After you have finished editing the applicationHost.config file, save the file, then restart the IIS server using iisreset or by restarting the system.