HTTP Error 503. The Service is unavailable
This error appears when opening UPM and Webconsole . Browsing to localhost (e.g. http://localhost/wac ) received same error “HTTP Error 503. The service is unavailable”
The 503 Service Unavailable error is an HTTP status code that means the web site's server is simply not available right now.
Event log message: ‘The Module DLL C:\Windows\System32\inetsrv\HipIISEngineStub.dll failed to load. The data is the error.’
Reinstalling IIS server or reinstalling webservice and webconsole will not resolve this issue .
Even If you try remove Host Intrusion Prevention (Host IPS) 8.0 from a Microsoft Server 2008 running with IIS 7.0, the ISAPI filter references do get removed from the IIS applicationHost.config file.
The problem is in conjunction with a McAfee update on a web server
To Fix this you need to perform following steps:
Edit the IIS 7.0 applicationHost.config file and remove the following configuration lines:
Go to Start > Run - type ‘ explorer ‘ and click OK.
Navigate to: %windir%\system32\inetsrv\config
Open the file ‘ applicationHost.config’ as Administrator and select Notepad to edit the file.
Edit the <globalModules> section and remove the following line:
<add name="MfeEngine" image="%windir%\System32\inetsrv\HipIISEngineStub.dll"
Edit the <modules> section and remove the following line:
<add name="MfeEngine" />
Once you are done editing the applicationHost.config file, save the file, then restart the IIS server
From command prompt type ‘ iisreset ‘
or restart the system.