Well, I see what is said but I'm not sure where it is connected...
Okay, let's try this systematically. Did you run the setup of Kppp? That is an absolute must (in case you didn't know).
I don't know what that is: /etc/hotplug/net.agent
. Do you? Is it a script calling modprobe? Perhaps it is documented or has comments in its file.
Now, modprobe: Can't locate module ppp-compress-21
is trying to load module ppp-compress-21 to the kernel and obviously doesn't find it. Search for it on your system, if you don't find it google for it.
I'm assuming that this causes the time-out.
Oh yes, and also look here