The Java Problem.

java.io an existing connection was forcibly closed by the remote host

I'm on windows 7 ultimate x64. No mods used, 100% vanilla. I'm in Brazil rn and she's in Germany. Our friend from Greece can join just fine.

Copy she gave me from logs:

[14:19:18] [Server thread/INFO]: iiCupkake joined the game

[14:19:23] [Server thread/INFO]: Saving the game (this may take a moment!)

[14:19:24] [Server thread/INFO]: Saved the game

[14:19:24] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2602ms or 52 ticks behind

[14:19:34] [Server thread/INFO]: iiCupkake lost connection: Timed out

[14:19:34] [Server thread/INFO]: iiCupkake left the game

[14:20:12] [Server thread/INFO]: iiCupkake[/179.---.---.21:61723] logged in with entity id 7778 at (-23.5, 63.0, -12.5)

now it works

[14:20:12] [Server thread/INFO]: iiCupkake joined the game

[14:20:18] [Server thread/WARN]: Memria moved too quickly! -9.522479480229606,-1.2491870787446828,-3.4653466808775306

[14:20:41] [Server thread/INFO]: <iiCupkake> i really need to change that name

[14:20:42] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2010ms or 40 ticks behind

[14:20:50] [Server thread/INFO]: [Pwnyyy: Teleported iiCupkake to Pwnyyy]

[14:21:14] [Server thread/INFO]: iiCupkake lost connection: Timed out

[14:21:14] [Server thread/INFO]: iiCupkake left the game

[14:21:48] [Server thread/INFO]: Memria has made the advancement [Acquire Hardware]

[14:22:30] [Server thread/INFO]: iiCupkake[/179.---.---.21:61733] logged in with entity id 11804 at (405.4516120880864, 75.0, 444.5401050528366)

[14:41:39] [Server thread/INFO]: iiCupkake joined the game

[14:42:10] [Server thread/INFO]: iiCupkake lost connection: Timed out

[14:42:10] [Server thread/INFO]: iiCupkake left the game

[14:43:02] [Server thread/INFO]: iiCupkake[/179.---.---.21:62464] logged in with entity id 42267 at (405.4516120880864, 75.0, 444.5401050528366)

[14:59:48] [Server thread/INFO]: iiCupkake joined the game

[14:59:55] [Server thread/INFO]: <CreeperofShadow> ... wat

[15:00:02] [Server thread/INFO]: <CreeperofShadow> is this your other account?

[15:00:11] [Server thread/INFO]: <Pwnyyy_> nah that's cloud

[15:00:13] [Server thread/INFO]: iiCupkake lost connection: Timed out

[15:00:13] [Server thread/INFO]: iiCupkake left the game

Anexing tracert bellow:

I use the latest one (1.13.something)

Going to DM you the IP, and testing it rn, will put results in edit

Additional info: Earlier today, i was able to join my german friend's server. Don't remember the exact time...

It solved itself for now

I appreciate the help anyways!