Greetings, I have tried IE8, Firefox 6/7, Chrome 4 and found that all of them can not support Socks5 proxy with user/password authentication. After my test, I get some points as bellow: 1. As a default setting, IE uses Socks4 which can not support user/password authentication. 2. Chrome uses IE's proxy settings. 3. Firefox can support both Socks4 and Socks5 but if Socks5, it still can not support user/password authentication. I know with some proxy tools like proxifier, freecap, I can make it but what if without such proxy tools? Anyone can help? BTW, I used CCProxy V7.2 to build my proxy server. I use Win XP Pro SP3 for my proxy server and Windows 7 Ultimate for the client. Any help or suggestions will be appreciated!