I see you posted this same issue in another thread. I'd stick with CS6 for now since the CC versions have bigger issues and the error you were getting in CS6 I'm sure you would get in the CC version since it is an issue with your testing server settings. If you send me your testing server settings I may be able to spot what you have wrong.
Just make sure you have a testing server defined for your site and that you can copy and paste the value you have entered for the Website URL into a browser and see the site you are working on in your testing server.