I have four roku's at home in Florida and they work fine.
I purchased a Roku Express here in New York and I'm at a campsite with a public Wi-Fi share.
When I set up properly I can see my wireless carrier I click it. It does not allow for a password but stops me at 2 questions 1. are you at a dorm or hotel 2. are you at home
No matter which one I check it locks in place and will not allow me complete setup.