How can I create custom error messages for Microsoft Proxy Server?

A. You can customize error messages (e.g., messages that tell you that you can’t access a page) that a client receives from a proxy server to display anything you require.

Simply place a page named as the error number (example ERROR 10060=10060.htm) in the directory C:mspErrorHtmls. Stop and start Microsoft Proxy Server, and it will load the new error message.