Windows dedicated server has plesk control panel. If you want to show any custom error to your sites, you can set the custom error documents for your site in plesk panel.
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Procedure
Enable Custom Error support for domain in Plesk Onyx Windows Dedicated Server Hosting
[1] Access your control panel at https://www.yourdomain.com:8443
[ ! Notes ]
The control panel url starts with https:// and not http.
[ ! Notes ]
[a] You must have port 8443 access enabled in your internet connection to access this control panel. Usually it is enabled, but if you are in a network and if your are not able to access this, please contact your network admin and enable this port.
[2] Supply the user name & password provided by Silicon House.
[ ! Notes ]
Give the correct user name and password .
[3] Click on subscriptions
[4] Click on subscription name
[5] Click on Hosting Settings
[6] Enable Custom error documents
[7] Click on ok