Me and my friend have played realms for a while now. After about a month my computer started exiting the realm with the message "Internal Exception: java.io.IOException: An existing connection was forcibly closed by the remote host". I have tried to search online for a solution, but nothing has come up. This is only when i play at my mothers house, and the realm will work fine when i'm at my farthers.
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This actually appears to be a duplicate of REALMS-3593, which hasn't yet been resolved. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.
Can you connect to other non-Realms servers on the device it doesn't work on?