Internal Exception: Java.io.IOExeption: An existing connection was forcibly closed by the remote host.
This was a message when I logged into a Realms server my friend owns. For 15s the pressure plate responded but didn't open the door, other things didn't respond before an old error of "Internal Exception: Java.io.IOExeption: An existing connection was forcibly closed by the remote host" popped up. Luckily, after 10m the Connection was normal again.
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This is a technical support issue, which we're already tracking in MC-38565, so I resolved and linked this ticket as a duplicate. We do not have the resources to provide you with technical support.
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