hi: I have several stations in W98 and W2K Pro with the firewall client installed. The domain controller is in W2K Advanced Server. I have the ISA server in another machine in W2K AS, joinned to the domain too. In some stations, every time I login to yahoo messenger, a pop up windows asks me for authentication, in other stations, the pop up appears 4 or 5 times!!! After filling the pop up window, I get the login to yahoo messenger. Any suggestion?? Thanks in advanced and excuse me my bad english.