Many public hotspots require you to authenticate or accept a "terms of conditions" agreement before allowing you access to the Internet.
If you tried to connect to our service before you have gone through this step, the connection will likely fail and alternate between connecting and reconnecting states.
When using such public hotspot, open a browser and navigate to any website (e.g. http://www.whatismyip.com/). If you see your content properly displayed, then the Internet connection is working properly and you should be able to use PrivateTunnel normally. If not, please follow the steps on screen to complete the authentication process. After the authentication process is complete, you should be able to connect with the software client as you normally do.