IIS Error: "Unexpected Error 0x8ffe2740 Occurred"

When I try to start IIS the following error message is displayed:
"Unexpected Error 0x8ffe2740 Occurred"

Solution:
This happens because some required ports are not available. The most common application using required ports is Skype. You can conigure Skype to not use these ports:

1. Open Skype


2. Choose Tools > Options > Advanced > Connections


3. Uncheck Use Port 80 and 443 as alternatives for incoming connections.


4. Restart Skype


5. Start IIS