Choose “Create a Web-Filtering Error service” Click on Add button
A new site is added on the main table but it is not in production because some settings must be added.
Click on the service name link.
In general settings, if only the Web error page engine will be published by the Web service, you can define it as “Default server”
Click on “Server names” tab.
Server names determine which server block is used for a given request. They may be defined using exact names, wildcard names, or regular expressions. Examples: example.org, www.example.org, *.example.org, error.*, 192.168.1.1, ~^(?.+)\.example\.net$
Click on “Ports” tab.
Add a new entry to add a new port to listen.
Use the 80 port and click on Add button
Click on the green arrow on your proxy PAC web service in order to make the Web service in production mode.