I have been having a lot of issues with my Minecraft server. It used to work perfectly and then suddenly everyone joining off local network would get kicked off with an error that always starts with, "Internal Exception: io.netty.handler.codec.DecoderException" but then ends in something different every time. Sometimes they are just kicked once and then can rejoin, but sometimes they are basically soft-banned from the server where they get this error every time they join. It has essentially made my server unplayable.
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I have tried the server with no data packs and with data packs. They don't make a difference. I have also started new maps, started up a new server from scratch, reinstalled Windows, allocated up to 26 GB of RAM to the server, absolutely nothing I have tried has given any improvement.
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Do you use any data packs? If so, please disable all of them except for the
vanillaone and check if the issue persists.