Can´t connect applet´s Java

Please help me...My browser is Internet Explorer 5.5 SP2.

All the Pc´s have the Plug In (Virtual Java Machine)

Before the ISA Server´s installation, I could view that´s sites, and I could 
navegate properly.
But now this function stoped, just with the ISA Server´s installation.
I´m sure that I might adjust some items on ISA Server.
May be I should create new protocols like SOCKS4 or SOCKS5
but I don´t know if that will fix the problem.

Someone said me: "there may be an issue regarding "Enable IP Forwarding" option 
in TCP/IP
Properties for Internal Interface"
But I don´t know how can I solution it!!!


Also I can´t use KAZAA from PC´s.

Thank in advance for your assistance...PLEASE HELP ME
Rubén

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