wsg, I installed Knoppix v3.4 r2004-05-10 on my system back on the weekend.
I ran into the same problem you had.

The problem is that KPPP is trying to access the modem, and not the PORT the modem is hooked up to.

KPPP -> Configure button -> Device tab -> Modem Device drop down list.
There, select the com port the modem is hooked up to.
Then on the Modem tab, click Querry Modem.
It should now find the modem.


Jenifur Charne