Forum OpenACS Q&A: Response to Mysterious refusal to connect to localhost by http

what happens when you "telnet 192.168.100.3 8001"?
is the machine connected to the network while you're doing this?

What I'm thinking is that maybe ForceHostP is set to true (it is true by
default) and that your web browser is being redirected to a name that dns
can't resolve because you aren't connected to the network.