Cannot resolve host name

[pVC]

I would still guess that this could be some incompatibility issue with the TCP/IP stack... why have you decided to use Inet-225? AmiTCP/IP's bsdsocket.library solution is the de-facto standard for networking software support on Amiga, and all newer stacks are also based on that, so using a stack that is based on older standards is for asking trouble sooner or later IMHO, and will restrict the sofware selection you can use.

[pVC]

Yeah, Roadshow is a good choice, but as you already have OS3.9 installed, you also should have AmiTCP/IP Genesis bundled with it, and you probably could try quickly if it'd work any better.