I deployed a web site to my local IIS, and then I got this error when I tried to visit it:
HTTP Error 503. The service is unavailable.
There are many complicated steps described in the google search results. But the worked solution for me is this simple one:
- Open the Internet Information Services (IIS) Manager
- Select the Application Pools node under the root node in the left hand side frame
- Right click on the DefaultAppPool. If the service is stopped, start it. If the service is running, restart it.
- Issue resolved.
Thank Richie for providing this solution.
To improve the computer performance, I made the application pools not to start automatically, so this issue occurs.