Make sure your server is online when you try to join.
Try to connect using your server DynIP, read more here: https://aternos.org/connect
it is online and i have tried to join via DynIP, still doesn't work
Posts by Tavioco
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Alright so basically i just cannot join my own server, every time I try it just says "Internal Exception: io.netty.handler.codec.DecoderException:java.lang.IndexOutOfBoundsException: readerIndex(25) + length(1) exceeds writedIndex(25): PooledUnsafeDirectByteBug(ridx: 25, widx: 25, cap: 25)". No idea what to do please help.