It's a real bummer, but when I was staying at the Omni Downtown in Austin, TX, I couldn't use the free WIFI access because of a continuing "Incorrect Network Settings" error when I tried to connect to a web page.
When I called Omni's Netowrk customer service, they couldn't help either.
Somehow I couldn't talk them into restarting the hotel's server, go figure.
..or updating the hotel's router firmware. The two fixes that probably would have worked.
No problems on my end, as I could connect in every airport along the way as well as my home and other connections.
Bummer. I spent 6 days there.