title: How can i connect two remote user for socket ftp
body: <p>i am trying to make a program to send file to an other user that works with socket but i can’t figure out how to open port automatically or bypass the port restriction. I heard about upnp with miniupnpc and it dosent work, i also tried to simply port map with upnp wizard and it said that it dosent found router with compatible with igd but in my router and windows setting everything is set to accept upnp port map an app called parsec even opened a port with upnp. I tryed on my friend’s network and it worked well, later on my research i found that my friend’s public ip is an ipv6 and mine is an ipv4 so maybe it has a link? Please help me i dont know what to do ( sry for the faults my english is trash)</p>