This error is generally caused by specific things:
1. Wifi - wifi connections can and do experience interference from outside sources, causing connectivity issues that prevent wtfast from connecting to it's required servers. We suggest using a wired connection.
2. Poor networking performance: In some cases, anti-viruses, firewalls and/or routers can be blocking access. Ensure that nothing is preventing wtfast from accessing the internet. Also check that there are no loose ethernet cables, and your router is not failing. (hardware can/does go bad!)
Cannot connect to GPN
Poor connectivity will generate this error, wtfast is unable to connect to its main server. You will be forced to use manual server selection - auto selection will be disabled.