Bugs and support asking about third part plugins should be reported/asked in the topic of the plugin, not this section of the forum.
Also apparently, you need to configure your firewall so that it doesn't block the port 843.
If you don't know what is a firewall is, make a search on google in your own language, firewall are common in networking/internet.
According to the firewall you're using you should then find the way to unblock the correct (firewall) port.