Forge Server not reachable for some of my users

[wiliwilliam]

I have got a forge server 1.19.2 (forge 43.1.7) 20 slots with some mods (the list at the end of this message).

No error, everything is working well. 3 of us are able to reach the server.
2 others can't.The server shows as unreachable. (Can't connect to the server)
They have got the good IP-port, they use the right mods in their right version and they are using forge 43.1.7.
Soooooo... I don't know what is happening. What can they do to join the server? What should I investigate?
I'm not even sure where the problem comes from because some players can still join the server.
Some of them have completely reinstalled the game to see if it was due to corrupt files or conflicts. No changes..

Thank you in advance for your help!

The list of the mod (not sure that mods are linked to this problem).
• Bookshelf (by DarkhaxDev)
• Tree Harvester (Forge) (by Serilum)
• CreativeCore (by CreativeMD)
• Storage Racks (by H3lay)
• BlockUI (by H3lay)
• Collective (Forge) (by Serilum)
• MineColonies (by H3lay)
• Domum Ornamentum (by OrionOnline)
• Multi-Piston (by H3lay)
• Structurize (by H3lay)
• JourneyMap (by techbrew)
• Just Enough Items (JEI) (by mezz)
• AmbientSounds 5 (by CreativeMD)
• Enchantment Descriptions (by DarkhaxDev)
• Neat (by Vazkii)
• AppleSkin (by squeek502) • Medieval Music[Forge/Fabric] (by someaddon)

Edited December 7, 2022 by wiliwilliam
additional info

[ChampionAsh5357]

Can you provide the debug.log files in the logs folder of the erroring client and the server itself?

[wiliwilliam]

from server, nothing than this: https://pastebin.com/aEhferUj from debug file.
Nothing from the latest.txt

I will try to get .txt from my users!

Edited December 7, 2022 by wiliwilliam

[wiliwilliam]

  On 12/7/2022 at 2:28 PM, ChampionAsh5357 said:

Can you provide the debug.log files in the logs folder of the erroring client and the server itself?

Expand  

Here is the log of one of the user which bugs: https://pastebin.com/3sdepecH

Edited December 7, 2022 by wiliwilliam

[wiliwilliam]

FYI: These people could easily connect to minecraft.koreus.com when it was a vanilla server.

[ChampionAsh5357]

This is not the complete log, but it seems as though the client or server is thinking the other is vanilla. Without the entire server log or client log, I cannot determine which is thinking what.

[wiliwilliam]

  On 12/7/2022 at 5:50 PM, ChampionAsh5357 said:

This is not the complete log, but it seems as though the client or server is thinking the other is vanilla. Without the entire server log or client log, I cannot determine which is thinking what.

Expand  

https://pastebin.com/twFCjzdq for the client.

 

For the server, there is literaly nothing at the moment this user is trying to log

Edited December 7, 2022 by wiliwilliam

[wiliwilliam]

the debug.log of the server at the same moment:

https://pastebin.com/FAUCPcEc

Edited December 7, 2022 by wiliwilliam

[ChampionAsh5357]

Yeah, so it seems that the clients are seeing that the server is vanilla. I'm not sure why this is the case, but you may want to check to make sure the server is correct or that what they are trying to connect to (if the value is somehow cached) is correct.