是不是需要做什么设置才能上？

请教呀！请大家帮忙吧。谢谢！

没什么限制，内网只能封掉BT之类的端口，对于FTP就不能封了，否则连网都上不了

是吗？可我输入地址，总是说
Error Code: 502 Proxy Error. The login request was denied. The logon account might have been disabled or logon information might have changed. Log on again to verify that the information was typed correctly. If the problem continues, report the problem to the administrator of the Internet server you are requesting. (12015)

而我们办公室里的PC也是一部分可以另一部分不行。