Me and my friend cannot connect to each others world
Me and 2 of my friends started a multiplayer solar system world about 2 weeks ago and at some point decided to add mods into it. It was all good at first but then one of my friends just couldn't connect anymore, while the other friend is completely fine. We tried pretty much everything (updated drivers, changed server settings, he tried fixing his firewall, router) but the issue still persists. Moreover, when I put up the world on Steam workshop and he downloaded it and hosted it, the issue started occuring to me. I couldn't find any helpful info on this so I'd be grateful if you could help me out.
Additionally, I provide logs for the last 2 days of us playing.