PaperMC
One player cannot connect to Fabric backend servers despite using the exact same MC instance as everyone who can
Expected Behavior
All players can connect
Actual Behavior
One player cannot connect - he gets stuck on loading world then gets the error message 'Unable to connect you to Lobby. Please try again later.' This still happens even if I change Velocity to make the default server the 2nd backend server ('Creative', using the same modpack). The player is using the exact same MC instance that everyone who CAN connect is using i.e. I exported my (working) instance as a zip, sent it to him, he imported it and ran it and it fails in the same way.
I've attached the relevant snippets from the Velocity and backend server consoles, and the client's logs.
client log (Prism launcher).txt
Steps to Reproduce
- Install my MC instance
- Try and join my server
- Be this specific player
Plugin List
Velocity: velocity, luckperms, vpacketevents, signedvelocity, carbonchat, proxy-command, rewhitelist, voicechat
Fabric 1.21.1 backend: accessible-step-fabric-mc1.21.1-2.1.0+1.21.1.jar additionallanterns-1.1.2-fabric-mc1.21(1).jar amendments-1.21-1.2.24-fabric.jar architectury-13.0.8-fabric.jar athena-fabric-1.21-4.0.2.jar bettercommandblockui-0.5.2a-1.21.jar BuildingWands-fabric-MC1.21-2.9.jar Camerapture-1.10.6+mc1.21.1-fabric.jar carbonchat-fabric-3.0.0-beta.32.jar chipped-fabric-1.21.1-4.0.2.jar cloth-config-15.0.140-fabric.jar collective-1.21.1-8.3.jar connectedglass-1.1.14-fabric-mc1.21.jar coords_copy-1.0-1.21.1.jar crossstitch-0.1.6.jar DiagonalWindows-v21.1.1-1.21.1-Fabric.jar doubledoors-1.21.1-7.1.jar doubleslabs-fabric-1.21.1-0.3.0.jar DramaticDoors-NeoQuiFab-1.21.1-3.3.2.jar elevatorid-fabric-1.21-1.11.1.jar emi-1.1.22+1.21.1+fabric.jar emotecraft-for-MC1.21.1-2.4.10-fabric.jar Essential_1-3-9_fabric_1-21-1.jar.disabled fabric-api-0.116.5+1.21.1.jar fabric-language-kotlin-1.13.4+kotlin.2.2.0.jar FabricProxy-Lite-2.9.0.jar FastItemFrames-v21.1.4-1.21.1-Fabric.jar FlowerPatch-fabric-1.21.1-7.1.0.jar ForgeConfigAPIPort-v21.1.4-1.21.1-Fabric(1).jar fusion-1.2.10-fabric-mc1.21.jar halfdoors-1.21.1-1.0-SNAPSHOT.jar instantgroup-fabric-1.21.1-1.7.0.jar iris-fabric-1.8.8+mc1.21.1.jar jei-1.21.1-fabric-19.22.1.316.jar LuckPerms-Fabric-5.4.140.jar malilib-fabric-1.21-0.21.9.jar mcw-bridges-3.1.0-mc1.21.1fabric.jar mcw-doors-1.1.2-mc1.21.1fabric.jar mcw-fences-1.2.0-1.21.1fabric.jar mcw-furniture-3.3.0-mc1.21.1fabric.jar mcw-lights-1.1.2-mc1.21.1fabric.jar mcw-paths-1.1.0fabric-mc1.21.1.jar mcw-roofs-2.3.2-mc1.21.1fabric.jar mcw-stairs-1.0.1-1.21.1fabric.jar mcw-trapdoors-1.1.4-mc1.21.1fabric.jar mcw-windows-2.4.0-1.21.1fabric.jar Measurements-fabric-1.21.1-3.0.1.jar modern-lights-2.5.0+[1.21-1.21.1].jar modmenu-11.0.3.jar moonlight-1.21-2.20.7-fabric.jar noclip-1.3.2+1.21-fabric.jar player-animation-lib-fabric-2.0.1+1.21.1.jar proxy-command-fabric-0.jar PuzzlesLib-v21.1.38-1.21.1-Fabric.jar rechiseled-1.1.6b-fabric-mc1.21.jar resourcefullib-fabric-1.21-3.0.12.jar Searchables-fabric-1.21.1-1.0.2.jar SignedVelocity-Fabric-1.3.0.jar sit-1.21-28.jar sodium-fabric-0.6.13+mc1.21.1.jar sodiumextras-fabric-1.0.8-1.21.1.jar supermartijn642configlib-1.1.8-fabric-mc1.21.jar supermartijn642corelib-1.1.18a-fabric-mc1.21.jar supplementaries-1.21-3.4.4-fabric.jar trowel-1.4.0.jar tweakeroo-fabric-1.21-0.21.59.jar voicechat-broadcast-fabric-1.1.0-1.21.1.jar voicechat-fabric-1.21.1-2.5.36.jar worldedit-mod-7.3.8.jar xercapaint-1.21.1-1.0.1.jar
Velocity Version
Velocity 3.4.0-SNAPSHOT (git-49e2988e-b525)
Additional Information
No response
UPDATE: I went through with the player, removing the mods and adding them back one-by-one, to test whether it's a mod issue.
We have found that as long as there are 46 or fewer mods enabled in his client, he can join. The moment we add a 47th mod, he can't join. It doesn't matter what the mods are.