Pablo,
Check out the handshake required between ur pc and the remote terminal(server). maybe ur handshake is not correct or there is some spelling mistake or something. if it is possible, for the remote host ur r dialing to, to monitor its connections ask them to do so. set up a time when some admin guy will sit at the terminal there and see if u are actually talking properly with that server there!
i dont think having an old modem is the cause of the trouble. check out the protocol ur using. :)
regards sagar sule
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