It turns out the latest version of ProtocolLib isn't compatible with Minecraft 1.12.1, so I just changed my server's software to CraftBukkit 1.12 and now it works. Thanks for the help, guys. :p
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So I've been using Aternos for about a year now and generally haven't had any problems with it. But just recently I started my server and everything seemed fine, but in my server list it said it can't connect to the server. I assumed this was a glitch and clicked it anyway, but an error message popped up:
"Internal Exception: java.io.IOException: An existing connection was forcibly closed by the remote host"
I tried connecting with the DynIP but that produced the same result. I checked the log file (board.aternos.org/wcf/attachment/555/) but I couldn't find any direct reasons for the error. I also saw that a few people on this forum have had this issue but none of the solutions people provided seemed to work. Help would be appreciated.