Port knocking always uses IPv4

[BitBlit88]

Hi,

if using the Port knocking options on a destination that has an IPv4 and IPv6 DNS entry, Kitty always knocks using the IPv4 address and then tries to connect (for example ssh) using the IPv6 DNS entry. If the destination has firewall rules to open ports according to the knocker's IP address, the connection will fail. Further it seems that Kitty doesn't support IPv6 port knocking at all. If using an IPv6 address as server name, port knocking doesn't work.