Cant play online on MHFU/GT

[tywald]

I see. And there is no 3rd party firewall installed either or? And btw, is it disabled for both private & public networks? Or just one of them?

If you don't use the 32-bit version of the emulator then you don't have to add it.

I don't know if you are aware but slowing down the emulator during loading screen isn't necessary anymore since v0.9.8-890-g1445d5a. If you don't know about it, it was just a trick to get it working over 2 years ago.
It shouldn't be that much of a problem, in my experience those that use it just creates unnecessary long loading for the others but it works if everyone just waits, provided that Fast Memory and Firewall(s) are turned off for everyone. Nowadays when the loading is long it usually means someone will break off.

You port forward in your router, you usually type 192.168.1.1 in your browser, you can check your connection details in Network and Sharing Center and look up what IP address your "Gateway" has, that would be the one to type in your browser to access the router. For me it was 192.168.1.1 as I said earlier. Login details is usually written underneath the device. You can check https://portforward.com/router.htm and find your router there to see how this process work.

If it still doesn't work then maybe try with a different PC.