Lux Zhang: >>> I need telnet to access adsl server. Tim: >> Really bad idea. Telnet is a really insecure protocol. If you can >> use ssh, use it, instead. Lux Zhang: > I have no choice, the modem can only handle telnet Unless it's the modem, itself, that you're telnetting to, then that's wrong. A telnet server is usually something running on a computer (and that seems to be what you've described), all a modem/router has to do is forward the right port number through to the computer. The port number is whatever you choose, you don't have to use defaults, and the modem doesn't care what goes through that port (telnet, SSH, HTTP, or anything else). If it is the modem that you need to telnet to, a far safer solution might be to disalllow the modem to receive WWW telnet connections, forward a SSH connection through to a PC inside your LAN, remote connect to it in a secure manner, then telnet from that internal PC to your modem. > But with remote telnet I got this > > [zhang@tring ~]$ telnet 79.15.54.181 7777 > Trying 79.15.54.181... > telnet: connect to address 79.15.54.181: Connection timed out > > In fact the server did show any response And does that work if you try telnetting to port 7777 on a machine inside your LAN rather than one outside it? I saw your prior message saying it worked inside your LAN, but 7777 is an unusual port to play with. Was it the same port number that you tested before? The default, for Fedora, is to run a firewall, so it could be blocked on the machine running your server, itself. -- (This box runs FC6, my others run FC4 & FC5, in case that's important to the thread.) Don't send private replies to my address, the mailbox is ignored. I read messages from the public lists.
