I installed Redhat and connect linux and another win2k to a DSL router, when I try to Ftp to linux from win2k, it prompts "connected to 192.168.XX.XX", then just sit there, no prompt for me to login, also the same thing to Telnet, I already setup port 21, 23 for ftp and telnet on router(firewall). I can use ftp, telnet on linux itself. what's happened?