Hi, I am running Win 2000 SBS using ISA Server. I cannot telnet to a linux server on the outside of my network on port 23, but I can telnet to it on port 110 from either the server running ISA or from any pc on the internal network. I have tested telnet on port 23 to the server from a pc outside of my network and it works fine. I have an outbound telnet packet filter to allow all local ports to remote TCP port 23, and an inbound telnet packet filter to block inbound attempts at local port 23 from any remote port. I also have a telnet protocol rule set to allow the telnet protocol only. Any ideas? Thanks... Rob