Problem Custom modpack- auto disconnecting from dedicated server

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UberAffe

New Member
Jul 29, 2019
143
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This is a custom modpack
It runs in SP and other players can connect via lan.
The server specific version has minecraft 1.7.10 server jar and the latest forge server jar for 1.7.10, and it starts up just fine.
When I try to connect to the server:
I can see the world for just a fraction of a second on my client and then the client says that there was a fatal error.
This is what happens in the console when a player tries to connect:
08.08 19:51:44 [Disconnect] User UberAffe has disconnected, reason: unknown 08.08 19:51:44 [Multicraft] Skipped 11 lines due to rate limit (30/s) 08.08 19:51:30 [Server] INFO at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:700) ~[DefaultChannelHandlerContext.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?] 08.08 19:51:30 [Server] INFO at cpw.mods.fml.common.network.handshake.NetworkDispatcher.flush(NetworkDispatcher.java:447) ~[NetworkDispatcher.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.DefaultChannelPipeline$HeadHandler.flush(DefaultChannelPipeline.java:1038) ~[DefaultChannelPipeline$HeadHandler.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:649) ~[AbstractChannel$AbstractUnsafe.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:260) ~[AbstractNioChannel$AbstractNioUnsafe.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:680) ~[AbstractChannel$AbstractUnsafe.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:231) ~[NioSocketChannel.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.nio.AbstractNioByteChannel.doWrite(AbstractNioByteChannel.java:178) ~[AbstractNioByteChannel.class:?] 08.08 19:51:30 [Server] INFO at io.netty.channel.socket.nio.NioSocketChannel.doWriteBytes(NioSocketChannel.java:214) ~[NioSocketChannel.class:?] 08.08 19:51:30 [Server] INFO at io.netty.buffer.UnpooledUnsafeDirectByteBuf.readBytes(UnpooledUnsafeDirectByteBuf.java:414) ~[UnpooledUnsafeDirectByteBuf.class:?] 08.08 19:51:30 [Server] INFO at io.netty.buffer.UnpooledUnsafeDirectByteBuf.getBytes(UnpooledUnsafeDirectByteBuf.java:408) ~[UnpooledUnsafeDirectByteBuf.class:?] 08.08 19:51:30 [Server] INFO at sun.nio.ch.SocketChannelImpl.write(Unknown Source) ~[?:1.7.0_76] 08.08 19:51:30 [Server] INFO at sun.nio.ch.IOUtil.write(Unknown Source) ~[?:1.7.0_76] 08.08 19:51:30 [Server] INFO at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source) ~[?:1.7.0_76] 08.08 19:51:30 [Server] INFO at sun.nio.ch.SocketDispatcher.write(Unknown Source) ~[?:1.7.0_76] 08.08 19:51:30 [Server] INFO at sun.nio.ch.FileDispatcherImpl.write0(Native Method) ~[?:1.7.0_76] 08.08 19:51:30 [Server] INFO java.io.IOException: Broken pipe 08.08 19:51:30 [Server] Netty IO #2/ERROR [FML]: NetworkDispatcher exception

BTW the log reads from bottom to top.
I can get a list of mods if that would also help.
My guess is that one of them isn't meant to be a server side mod.