I went through this guide and was able to get it working on both Ubuntu 15.04 and Debian 8. Since things can fail for a variety of reasons, I couldn’t think of a single article to provide when troubleshooting.
You may wish to check if it’s just you that cannot connect, as if it’s with multiple distributions; it’s starting to sound like a possible local issue with your network. Perhaps they are blocking something required to connect.
If it’s still not working, what errors are you getting? Providing detailed information when you are having issues is very important so others can take steps to replicate and hopefully provide a solution.