Netcom X error's ????

mfabus: i get netcom X has sutdown errors on my mac running with 10.2.8
  mfabus: Where i look i can't find any thing or information
  mfabus: when i remove the network cable the problem is gone

When i hook up a other mac using the samen osx version and connect the
network cable the error's are the same ?? When i hook up on a other network
the problems are gone.

Regards,
Marco