I have a local copy of SQL 2014 running on my computer that I use for testing purposes for web development. It works great as long as I am either A. not connected to the internet (ie, on travel and just working) or B. on my local dedicated IP address internet connection. If I use my broadband card for mobile internet, I get The requested instance is either invalid or not running. I have never had this with my old computer so I clearly am missing some set up in SQL... Any ideas?