Users with Forge can't join Vanilla Server

[Cybertec]

So we tried to join on our Paper Minecraft Server with multiple Plugins, on multiple Accounts on different Forge versions, but for everyone the Server is offline. With a Vanilla or Fabric client it works completely fine, so i guess it has to do something with Forge. 

 

This is the Error Message when trying to join:

[27Nov.2022 20:01:05.635] [Server Connector #1/ERROR] [net.minecraft.client.gui.screens.ConnectScreen/]: Couldn't connect to server
io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection timed out: no further information: gandossandkasten.ddns.net/[2a02:810b:44c0:5a64:4d63:cee:794c:ee2a]:25000
Caused by: java.net.ConnectException: Connection timed out: no further information
    at sun.nio.ch.Net.pollConnect(Native Method) ~[?:?]
    at sun.nio.ch.Net.pollConnectNow(Net.java:672) ~[?:?]
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:946) ~[?:?]
    at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:337) ~[netty-transport-4.1.77.Final.jar%23111!/:4.1.77.Final]
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334) ~[netty-transport-4.1.77.Final.jar%23111!/:4.1.77.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:710) ~[netty-transport-4.1.77.Final.jar%23111!/:4.1.77.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:658) ~[netty-transport-4.1.77.Final.jar%23111!/:4.1.77.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:584) ~[netty-transport-4.1.77.Final.jar%23111!/:4.1.77.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:496) ~[netty-transport-4.1.77.Final.jar%23111!/:4.1.77.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:995) ~[netty-common-4.1.77.Final.jar%23106!/:4.1.77.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.77.Final.jar%23106!/:4.1.77.Final]
    at java.lang.Thread.run(Thread.java:833) ~[?:?]
[27Nov.2022 20:01:12.990] [Render thread/INFO] [net.minecraft.client.Minecraft/]: Stopping!