In order to fix the issue, go to Start > Control Panel > System and Security > Windows Firewall > Allow a program through Windows Firewall and check the box next to Guide Plus. If you can't find the application in the "Allowed programs and features" window, press the Allow another program button, navigate to the installation directory, select the executable file and press Add.
After that, from the Advanced Settings select Inbound Rules > New Rule. Check the Port box, click Next, select All local Ports and follow the self-explained steps. Also, make sure that your security program doesn't block the connection. If the problem persists, uninstall and install the application again. If it still doesn't work, it's possible that the servers are down or under maintenance.
