SOLVED Netplay troubleshooting

[ivwshane]

I'm testing the netplay functionality and then I host a game (launch with X) it loads the rom, a message appears on the bottom of the screen that I've joined a player 1, the title spears, and then it kicks me out to the game list menu. I can play the game locally just fine.

What issues do I need to look for? If it matters I'm trying super Mario kart for snes and I've tried super street fighter ii as well.

I'm on a 100mb wired connection.

[acris]

@ivwshane
use catsfc or snes9x

no snes9x_2010 it not working

[joinski]

I'm also testing the netplay functionality and i am not able to get it running. I have 2 PCs with Recalbox 18.06.27 (x86_64), both with identical settings and roms and connected to the internet.
When i start the host on the first PC and try to join from the second PC it always says:
"Failed to initialize netplay."

I tried with catsfc and snes9x (no snes9x_2010)
I scraped and hashed all my roms
And in Netplay Lobby i get the green Ok result (Rom and core match).
But still it does not work ("Failed to initialize netplay" on the PC that tries to join the host).

++UPDATE++
Problem solved! It was the UPnP-Settings in my Router. I activated UPnP and now it works