Sometimes something rather easy to be done can be really annoying if you are not sure what to do and where to click.

In this case we will talk about creating a domain alias in IIS on Windows server.

Login to your server and click on the START button then ‘Run…’, and then type ‘inetmgr.exe’.

Certainly you can go and click trough the Administrative tools section to start ISS manager, but for me this is fastest and easiest way.

Now expand the (local computer), then ‘Web Sites’ and locate the site for which you want to add alias (here it is called additional web site identification).

Right click on the domain and choose ‘Properties’ option at the bottom.

This will open the properties window where you have to choose ‘Web Site’ and then to locate ‘Website identification’ section. Click on the ‘Advanced…’ button which stands next to the IP of the domain.

Advanced Web site identification window (Microsoft likes to see the word ‘Advanced’ in all of the management menus) will be opened, where we are going to add a new domain alias.

Click on the ‘Add…’ button and ‘Add/Edit website (alias)identification’ window will appear.

Make sure that you will choose the same IP address from the dropdown menu, then set the port number on which your web server is running (the default is 80), write the domain you want, and click ‘OK’ to create the new domain alias.

Actually click ‘OK’ until you have ‘Advanced Web site identification’ and the domain properties windows closed.

Right click on the domain again and ‘Stop’ and ‘Start’ the service.
This will be enough the IIS domain alias to start working.