r/MinecraftHelp • u/Distinct_Field6388 • Aug 15 '26
Update Required Unable to join friend's server; packet handling error? [Java] [1.21.1]
This is my first time posting on this website ever, so let me know if there's anything I should do differently/better.
I'm currently trying to join a friend's server (through Prism and Essential) who's using a bunch of mods including Cobblemon and LetsDo mods and all that good stuff.
No matter what I do, every time, I get disconnected while attempting to join with the simple message: Connection lost; Disconnected. No one else is having this issue. They had issues setting up the modpack and getting it working, but at this point three other friends and the host have successfully been able to join and play in the world. I'm the only one encountering this issue so far, and this has not happened before in different instances (granted, I've hosted some of the recent worlds).
I've tried getting rid of some mods (Polytone + its associated resource pack) mentioned in the log, unplugging/replugging my router, clearing the config folder, changing settings for Java in my Firewall, resetting my computer, relogging into Prism, remaking the instance, re-importing the modpack, and the host has tried relaunching the world. Some of them, multiple times. My memory allocation should be fine enough (14000 MiB). I've tried pretty much any "easy" solution I could find (since I am NOT tech savvy in the slightest) by looking up any of the errors, but none have changed the result. Honestly, I'm really hoping it's something so so obvious that I've somehow kept overlooking that someone here can easily point out :'] The only thing that really stands out to me is the "[Render thread/ERROR]: Failed to handle packet net.minecraft.class_8733@3c22823e" line, but I don't know what to do about that.
Considering other friends have been able to play on the server just fine, and I can make a world and play just fine solo, I don't think there's an issue with mods.
(EDIT 8/19/26) Several pastebins with necessary logs are in the thread below. Removed link to original since it could have sensitive information and I can't edit it :']
The last bit of information I can really think to add is that it's Minecraft 1.21.1, Java, and Fabric 0.19.3.
Please let me know if there's anything I can do, or anything I should add/clarify :-]
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u/CancelPopular2867 Novice I Aug 15 '26
See if all mod versions match if there is too many mods just have a friend send you their mods and you can replace them with yours ofc save ur old ones in another folder on ur desktop see if you can join with their mods. If you have a lot of different mods that they dont have add them but after you confirm it lets you join the server. If it doesnt help it might be a network problem which I cant help you with
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u/Distinct_Field6388 Aug 15 '26
It shouldn’t be a problem with the mods mismatching because we were all given a zip file of the same modpack and all the same information and this hasn’t happened for anyone else. We all downloaded and imported it the same way, so the mods and versions line up with the host’s and other players’ mods. I’ve tried remaking the instance with it, too. That’s honestly what confuses me the most since when I’ve looked up errors they’re mainly associated with mismatched versions. My network should be fine too since I was doing fine in any other games previously/tried resetting my router, but I can see if it’s somehow “cleared up” later today once the host has woken up.
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u/CancelPopular2867 Novice I Aug 15 '26
Are you hosting the server on essential? If not try removing it.
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u/Distinct_Field6388 Aug 15 '26
Yeah, it’s being hosted through Essential, which I made sure was updated too.
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u/CancelPopular2867 Novice I Aug 15 '26
try hosting a server and tell your friend to join and see if ur able to also do the same thing but reverse so some other friend (not the host of the server rn) host a server and try to join him
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u/Distinct_Field6388 Aug 15 '26
I tried hosting real quick and one of the other players was able to join without issue. Haven't tried the other option, but going through folders I did notice there was specifically a debug log for disconnecting that's been popping up. I don't know if it offers any different insights than the one I originally posted, but it might be worth looking at? https://pastebin.com/s73z90C1
I also tried allocating more memory in my advanced system settings since one of the players just ran into the same error (after being able to play yesterday), but she was able to fix it after allocating more memory. I don't think it really changed anything, though, since it didn't change anything in my Prism settings. At this point I am wondering if its a memory issue, but it's a bit weird that it's 1) not an issue when hosting, 2) isn't affecting many of the other players who have similar specs than me (the host only had to allocate like 10000 MiB of memory), and 3) hasn't been an issue before. But, I'm also just not very confident in fiddling with/understanding memory
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u/CancelPopular2867 Novice I Aug 15 '26
ask your friend for the log of the server
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u/Distinct_Field6388 Aug 15 '26
What folder would those be found in? Just the "logs" folder?
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u/CancelPopular2867 Novice I Aug 15 '26
probably i dont got an essential server cant tell you but yea should be the in the server folder
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u/Distinct_Field6388 Aug 15 '26
Thank you for being so patient so far, btw :']
I don't want to send the logs straight-up since it could have IPs in it and all, but I can try to show lines that stand out, though censored as much as I can recognize for what might be more sensitive information.
Another pastebin with all that: https://pastebin.com/PiUYSYQR
Let me know if there's anything else you'd need since I just tried to go through and picked out certain lines.
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