Hey,
Welcome to the site... hopefully you'll have better luck.
About that error, who's your host? I would contact them, that's usually a misconfiguration on their end, which they need to fix, or you have to specify a certain host to connect to (that's not "localhost"), but I would start with contacting them first.
Are you on bluehost, by any chance? Someone else also had this error, after a bluehost did an upgrade