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

For anyone coming here with Windows 10 and after updating them to Anniversary update, please check this link, it helped me:

https://orcharddojo.net/blog/troubleshooting-iis-apppool-crashes-status-503-after-windows-10-anniversary-update

In case link goes down: If your Event log shows that aspnetcore.dll, rewrite.dll (most often, but could be others as well) failed to load, you have to repair the missing items.

Here are two specific issues we've experienced so far and how to fix them, but you may bump into completely different ones:

"C:\WINDOWS\system32\inetsrv\rewrite.dll" (reference)
    Go to "Programs and Features" (Win+X, F) and repair "IIS URL Rewrite Module 2".
"C:\WINDOWS\system32\inetsrv\aspnetcore.dll" (reference)
    Go to "Programs and Features" (Win+X, F) and repair "Microsoft .NET Core 1.0.0 - VS 2015 Tooling ...".