Ahoy everyone! Well, I made an account on here just to report my issue because I been living with this error for 2 years and 2 years when I first bought Minecraft for my own use. I try googling and watching videos on YouTube to fix the problem but I see nobody has fixed it. I am reporting the: Internal Exception: java.io.IOExpection: An existing connection was forcibly closed by the remote host. because this is now happening on 1.15.1 and I had the issue before on version 1.13. I am not using any mods for the issue to continue. This problem only happens if I log in to any multiplayer server. (Due to my frustration, I took a 3 month break away from Minecraft, after those months had past I download Minecraft on my new laptop and hoping that every problem only happened if I was on my out-to-date computer but nope, the error is haunting every device I own.)
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Thank you for your report!
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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This IOException is possibly thrown due to a blocked port (25565) in your firewall settings. If you cannot change your firewall settings directly, try setting them to medium or low, then the port shouldn't be blocked anymore. I'm telling you this (even if it doesn't work) because I had the same problem several years ago (I used a temporary internet connection with high firewall settings back then).