Open port check tool

[Daniel15]

Received via email:

Hi,

I wanted to make a suggestion, I often times find myself trying to troubleshoot port forwarding issues on both IPv4 and IPv6 when there are multiple routers involved.

Would you consider adding a port visible / reachable check?

Other websites do it but it would be great to have a one stop shop.
https://www.yougetsignal.com/tools/open-ports/
http://www.ipv6scanner.com/cgi-bin/main.py