My mbp wont connect to a particular wifi network. Im trying to connect to a free network where you need the log in user name password but it wont connect, a little exclamation mark ! appears on the airport icon in the top right. It will connect to another free wifi spot that it finds, and loads the logon page (but i dont have the password etc for that one) It connected fine 2 days ago, my iphone will connect and so will my imac. Ive tried creating a new airport, and ive tried creating a new location in airport settings but nothing seems to work please help?