Proxifier cannot work with generic HTTP proxy servers like web browsers. HTTP proxy server should support HTTPS connections. Such proxy servers are also known as:

• HTTPS proxy
• CONNECT proxy
• SSL proxy

To test your HTTP proxy server you can use our Proxy Checker Tool (Windows only):
https://www.proxifier.com/docs/win-v3/checker.htm

This program can test your proxy server, provide you with an easy-to-understand report and recommend ways to resolve problems. Currently it is available for the Microsoft Windows Operation System only.