We have to install proxy isa 2000 it works well but we have a probleme with the cache of the macs. That is when I update a page html on our site, on pc when I make " update the page " the page is refresh whereas on mac it is not it. Indeed sùr the mask of the mac ( customer) was vidé.i do not understand(include) how the proxy can give 2 different images onto the network same. Thanks for u help.