Hello   @xalbertrosx 

It's normal. Some ports are open for Wi-Fi powerline device only in the LAN or local network for some services. 

• Port 80 for http web service
• Port 53 for DNS service
• Port 22 for tpPLC APP ( restricts ssh login, only for app service)

Note, the above ports are not open to outside network but only in your local network unless you particularly set port forwarding setting on router.

Hope this helps.