I am having the same problems.

I am frustrated and probably don't know what I'm doing. I have a test
server up and all my PC clients can reach it fine. My Mac clients
cannot. Everyone
is on the same subnet here. I can ping the server by name, by FQDN,
and by IP from The Mac but not via HTTP. The error is 'server not
found'.

I have tried various authentican schemes, and I have anonymous access
activated, and added to the guests group and even gave it 'everyone'
permissions - thinking maybe it was an authentication problem.

My goal is to have a public facing site  that supports Mac and PC that
also has links to secured portions or sites. I want no login required
coming to the site, just when you try to access secured areas.

Any Free clues?