Cannot connect to host with FM 4.4

[tryhardblackguy]

So I have not played Netplay in months so I tried to play through netplay on Smashladder and I found that they have new versions such as FM. I download FM correctly and when I try to connect to someone I cannpot join and a message pops up saying that I failed to connect to host, but on the other hand people can join me. I don't know if during my time not playing on netplay that something different happened to my internet but I have been having other problems with some online games and I had to open some ports and port forward for some games. Do people know the problem or did this ever happen to someone before? And sometimes my games lags when I host. Thank you.