Minecraft Cobblemon Star Academy : can't connect to my own server

spmattei · March 10, 2025, 3:55pm

Hi everyone

I am trying to play Minecraft Java, with Cobblemon Star Academy mod on CurseForge. It is my own first server, I’m both new to Minecraft and Ubuntu (y e s it’s a lot).

I can launch Minecraft but unfortunately, when i try to connect to my serv, I have this message: “Connection Lost : Received a registry entry that is unknown to this client. etc”.
I can connect from my windows PC without any issue, and my friends can also connect.

Here are my logs and the complete error message.

If anyone has any idea about what I should do, please do not hesitate and thank you very much !

Acer Aspire V3-772G
Intel Core i7
Ubuntu 24.04.2 LTS
Gnome 46

Error Message :
https://ibb.co/v6GWxhqd

Mes latest logs :
https://uploadnow.io/f/3YdwnhS

[03:10:48] [Render thread/INFO]: Connecting to spm.mine.fun, 25565
[03:10:49] [Netty Epoll Client IO #1/INFO]: [Handshake] Sending client channels
[03:10:49] [Netty Epoll Client IO #1/INFO]: Received server config
[03:10:49] [Netty Epoll Client IO #1/INFO]: Applying server overrides
[03:10:49] [Netty Epoll Client IO #1/INFO]: Responding with client values
[03:10:49] [Netty Epoll Client IO #1/INFO]: setting max image size to 200000 bytes, max resolution to 1280
[03:10:49] [Render thread/INFO]: Reloading pipeline on dimension change: minecraft:overworld => minecraft:overworld
[03:10:49] [Render thread/INFO]: Destroying pipeline minecraft:overworld
[03:10:49] [Render thread/INFO]: Creating pipeline for dimension minecraft:overworld
[03:10:53] [Render thread/INFO]: Started 2 worker threads
[03:10:53] [Render thread/INFO]: [voicechat] Sending secret request to the server
[03:10:54] [Render thread/INFO]: REGISTERING FABRIC CLIENT COMMANDS
[03:10:54] [Render thread/INFO]: Synced amendments-common.json configs
[03:10:54] [Render thread/ERROR]: Received unknown remote registry entries from server
[03:10:54] [Render thread/ERROR]: Registry entry (minecraft:starter_mode) is missing from local registry (minecraft:command_argument_type)
[03:10:54] [Render thread/ERROR]: Registry remapping failed!
net.fabricmc.fabric.impl.registry.sync.RemapException: Received a registry entry that is unknown to this client.
This is usually caused by a mismatched mod set between the client and server. See the client logs for more details.
The following registry entry namespaces may be related:

minecraft

	at net.fabricmc.fabric.impl.registry.sync.RegistrySyncManager.checkRemoteRemap(RegistrySyncManager.java:388) ~[fabric-registry-sync-v0-2.3.3+1802ada577-70a9685310656ab1.jar:?]
	at net.fabricmc.fabric.impl.registry.sync.RegistrySyncManager.apply(RegistrySyncManager.java:284) ~[fabric-registry-sync-v0-2.3.3+1802ada577-70a9685310656ab1.jar:?]
	at net.fabricmc.fabric.impl.registry.sync.RegistrySyncManager.lambda$receivePacket$0(RegistrySyncManager.java:118) ~[fabric-registry-sync-v0-2.3.3+1802ada577-70a9685310656ab1.jar:?]
	at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?]
	at net.minecraft.class_1255.method_18859(class_1255.java:156) ~[client-intermediary.jar:?]
	at net.minecraft.class_4093.method_18859(class_4093.java:23) ~[client-intermediary.jar:?]
	at net.minecraft.class_1255.method_16075(class_1255.java:130) ~[client-intermediary.jar:?]
	at net.minecraft.class_1255.method_5383(class_1255.java:115) ~[client-intermediary.jar:?]
	at net.minecraft.class_310.method_1523(class_310.java:1175) ~[client-intermediary.jar:?]
	at net.minecraft.class_310.method_1514(class_310.java:802) ~[client-intermediary.jar:?]
	at net.minecraft.client.main.Main.main(Main.java:250) ~[fabric-loader-0.16.9-1.20.1.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480) ~[fabric-loader-0.16.9.jar:?]
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.16.9.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) ~[fabric-loader-0.16.9.jar:?]
[03:10:54] [Render thread/WARN]: Failed to get file path of mod heartstone: /
[03:10:54] [Render thread/WARN]: Failed to get file path of mod moonlight: /
[03:10:54] [Render thread/WARN]: Failed to get file path of mod amendments: /
[03:10:54] [Render thread/WARN]: Failed to get file path of mod labels: /
[03:10:54] [Render thread/WARN]: Error while parsing the block ID map entry for "block.10104":
[03:10:54] [Render thread/WARN]: - The block minecraft:stone_slab has no property with the name variant, ignoring!
[03:10:54] [Render thread/INFO]: Stopping worker threads
[03:10:54] [Render thread/INFO]: Started 2 worker threads
[03:10:54] [Render thread/WARN]: Shader clouds could not find uniform named ModelViewMat in the specified shader program.
[03:10:54] [Render thread/WARN]: Shader clouds could not find uniform named ProjMat in the specified shader program.
[03:10:54] [Render thread/WARN]: Shader clouds could not find uniform named ColorModulator in the specified shader program.
[03:10:54] [Render thread/WARN]: Shader clouds could not find uniform named FogStart in the specified shader program.
[03:10:54] [Render thread/WARN]: Shader clouds could not find uniform named FogEnd in the specified shader program.
[03:10:54] [Render thread/WARN]: Shader clouds could not find uniform named FogColor in the specified shader program.
[03:10:54] [Render thread/WARN]: handleDisconnection() called twice
[03:10:54] [Render thread/WARN]: handleDisconnection() called twice
[03:10:54] [Render thread/WARN]: handleDisconnection() called twice
[03:10:54] [Render thread/WARN]: handleDisconnection() called twice
[03:10:54] [Render thread/WARN]: handleDisconnection() called twice
[03:10:54] [Render thread/WARN]: handleDisconnection() called twice
[03:10:54] [Render thread/WARN]: handleDisconnection() called twice
[03:10:54] [Render thread/WARN]: handleDisconnection() called twice
[03:10:54] [Render thread/WARN]: handleDisconnection() called twice
[03:10:59] [Render thread/INFO]: [voicechat] Clearing audio channels
[03:10:59] [Render thread/WARN]: [SeamlessLoadingScreen] Fade screen has been skipped due to someone replacing the screen before we could add our own after DownloadingTerrainScreen
[03:10:59] [Render thread/INFO]: Stopping worker threads

Actionparsnip · March 10, 2025, 4:10pm

can you ping the server?
Can you connect to the Minecraft port using this command:

timeout 1 bash -c ‘cat < /dev/null > /dev/tcp/hostnamehere/portnumberhere’ && echo “success” || echo “fail” 2>/dev/null

If you get “failure” then check the server allows exernal connections and, if you have configured a firewall, that the port is open there.

spmattei · March 10, 2025, 7:35pm

Thank you for your kind answer.

For now, if I do what you ask me, I seem to have invalid arguments. I might not understand everything unfortunately.

timeout 1 bash -c ‘cat < /dev/null > /dev/tcp/SPMon/25685’ && echo “success” || echo “fail” 2>/dev/null
bash: 25685’: Servname() n'est pas supportée pour ai_socktype
bash: /dev/tcp/SPMon/25685’: Argument invalide
“fail”

“SPMon” is the name of the server, at least how I named it on my game.
“25685” is the connection port of the server.

Can you tell me where my mistake is? Thank you

ian-weisser · March 10, 2025, 8:30pm

That suggests that your server is working properly.

It’s not an Ubuntu-related problem.
Your client finds the server and communicates with it.

This error suggests that your server and client don’t have exactly the same mods installed.
Review the mods installed on both. Look for mismatches.
A fresh set of eyes from your friends can help.

spmattei · March 11, 2025, 4:47pm

Thank you very much for your help <3 I will take a deeper look

kwixy · March 13, 2025, 6:28pm

Hi, I have the same problem! Have you been able to solve it by any chance ?

Wild_Man · March 13, 2025, 6:41pm

Hi kwixy, please start your own topic with a descriptive title, using the template to give all the pertinent information in the correct category and tags because while your issue seems to be the same most of the time the underlying cause is different and it gets confusing helping more then one person in a topic.

kwixy · March 13, 2025, 7:43pm

Oh okok sorry, I’ll do that ty!