"ie0: Ethernet jammed" on a Sun 4/110

[Diller]

I can't say for sure but in the Sun 3/60 there is an internal
jumper which when set one way will work with "cheaper-net" and
when set the other way works with ether-net. I can't say for
sure but the error you are getting sounds like you may have an
un-terminated network. You may want to check if this jumper
situation applies to the Sun 4/xxx.