iFlyChat Wordpress not working

Hello, I just installed the plug-in iFlyChat for wordpress on my test domain (https://areatesttn.altervista.org).

My Wordpress test installation is at this path https://areatesttn.altervista.org/wordpress-test/

Searching the web I discovered that I should check under Resources>PHP settings if the external server I try to connect is whitelisted, which is not at the moment...

Can anyone help me? The site that I need whitelisted for the messaging tool to work is https://v2.iflychat.com

You can unlock the whitelist from here.

Bye!