Make sure the application is allowed to communicate with Internet through firewall. Go to Start > Control Panel > System and Security > Windows Firewall > Allow a program through Windows Firewall and click Allow another program button. Use the Browse option to navigate to TelPik.NET installation directory, select its executable file and press Add. After that, go to Windows Firewall, press Advanced Settings and select Inbound Rules. Click New Rule from the right, check the Port box, click Next, select All local ports and then Next again. Check the Allow the connection box, press Next twice and follow the instructions. If the problem is not solved, I suggest you to install the latest version of the software.