Recently while working I faced an issue where the website (IIS 7) was showing 503-Internal Server Error. Checking Event viewer shown following Events for IIS
IIS Application Pool Crashed: The Module DLL C:\Windows\system32\inetsrv\rewrite.dll failed to load.
After migration of your website (from ServerA to ServerB) to a new Webserver when you try to access the website you get “503 Error – Service Unavailable” Error on your website and IIS Management Console shows that application pool of the site is crashed or stopped. Even after you start the application pool of the site it is getting crashed when someone try to access website.
FIX:- HTTP Error 500.24 An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode.
Sometime when you try to setup a application for your website on IIS7 you get following error when you load your website.
Milind Koyande is the Senior Research Engineer and his job is to work with new technologies, specially Cloud Computing / Virtualization Technology. His past projects include Government Sector initiatives, Backup and Disaster Recovery Solutions. Follow him on 
