Hi,

it is not exactly impossible but..... you will run into problems.
The telnet server expects a tcp connection that persists during the entire session, while flash normally uses http, one tcp connection per data exchange.
So either you have to use persistent connection from your swf, that is run a flashcom or xml socket on the webserver, or you must start some process on the webserver that will continue to run after a data exchange, and wait for the next interaction from the swf. This might be perceived by the server operator as a trojan

Musicman