Citra Online error

I have a little problem with the online.
With a friend , we try to play together but when i create a room, he can’t connect to the room …
I put below the screenshot to understand the problem.
Thank you for your attention.

online error citra

In order for us to provide better support, we need to see the log generated by Citra. This guide will walk you through how you can obtain the log file: How to Upload the Log File.

You need to port forward in your router.
How to do that depends on the model

same here, i have port forward on my router but my friend still can’t join

FYI : 2 days ago, i have port forward on my router, and we can play together. But now it can’t

Check if your local IP address got changed, you would need to adjust the port forwarding settings in that case. Maybe consider setting up static IP so your computer always get the same local IP address.