FTP&Telnet problems with DSL

I just bought a new notebook and was trying to use the same Bellsouth DSL moderm as before. I found I couldn't use FTP and Telnet to access other server anymore. The telnet screen just shows nothing and for the FTP, it just tells me the connection failed.

I can use FTP and Telnet with this computer at a friend's home by using cable. So I guess it is the DSL setting's problem. However the DSL tech supports are too pool, they even don't know what telnet is when I called them.

Can some one give me some help here.
thanks.

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