When the connection in Drop Zone fails, it is usually caused by your firewall. Make sure that the following ports are open in your firewall:

• 80
• 443
• 5657
• 8080
• 8089

Port 8089 may be configured to another port under Settings in the Drop Zone application but it is set to 8089 by default. 

If you are running Windows firewall, we recommend reading the following guide: Opening Windows Firewall for client connections to server. It explains how to open ports for Ship Client connections, but the procedure of opening ports in the firewall is the same for Drop Zone.