I know this topic was discussed here times ago, but i tried the solutions provided and i had no luck, i only made to block the sending of emoticons, but not the files. Here is what I have already block: - TCP connection (both ways) using the ports 6890 trough 6899 - TCP connection (both ways) using the port 6900 and 6901 - TCP connection (both ways) using port 5190 - TCP connection (both ways) on port 33979 - UDP connection (both ways) in the range 5004-65535 I'm using ISA 2000. Tks. Nivaldo Soraggi Fernandes