Same issue (Can't connect to Internet) and I've tried all the fixes.
Deleted and Reloaded Spotify, restarted router, checked wifi and cabled connections, cleared cache, logged out and back in, not a firewall issue, only use on one device (A Laptop), updated my proxy, changed to include HTTP, ummm....anything else posted that I've forgotten, I've tried it.
Don't use Facebook. Any other ideas?
P.S. My work computer with a seperate account works great. No issues ever. That comp is a dinosaur, but it handles Spotify beatifully. I love spotify but I'm forced to use other programs at home.
Re: No internet connection (error 4)/Local files not loading/"Error in template application&