I also get this same error message when I invoke the command
'ppp -disconnect dialup'. I've checked my /etc/ppp/ppp.conf file, and it
looks fine. I'm trying to access my modem at /dev/cuaa2. I read in the
supported hardware file that COM3 and COM4 are disabled by default, and that
they need to be enabled in UserConfig. I think that may be my problem, but I
can't seem to find UserConfig.
type -c at the boot: prompt (right after bios finishes up)
also check your kernel config file for the sio2 device.
Alternately, you can switch around the sio0/1 io and irq values to
match the standard COM3 settings.