I hate going to businesses who offer "free wifi" but then block port 22. Also I've noticed that Comcast blocks port 22 at some places I've visited.  I used to get around it by running ssh over port 443 - but more recently businesses have been blocking that as well and when you ask why - their IT department has no idea. It's ridiculous and a major problem when it blocks access to git repositories, etc. Fortunately setting up ssh over SSL is easy with HaProxy.