@ salocinx
I agree with Thomas. Something is wrong with the network card.
In case you're not aware, the X-Surf is actually a single-slot Zorro-to-ISA bridge with an ISA network card soldered in place. The "good news" about your problem is that it can probably be fixed by disassembling the board and replacing the ISA card. Will require soldering, though. I don't know whether it has to be the exact same card or just any card with the RTL8019 chipset, but Jens can probably tell you. I'm sure there's some way to contact him through his website. He might even be able to do the replacement for you, but expect to pay for it - the X-Surf 3 is looooong out of production and warranty.
