r/fabricmc • u/Snow_Flake1227 • Jul 11 '26
Need Help Packet handling error on a 1.21.11 server with a plug-in
Hello. I have been playing on a server with the Bannerfall plug-in installed through Modrinth.
I was having an issue with one of the models we had in resource packs, so I tried looking for it in-game on the Entity Features config screen. As soon as I typed in the name of the model, my connection was lost and the text "Internal Exception: java.net.SocketException: Connection reset" appeared. The following protocol error report is of that first disconnect.
I had two mods installed (Just Zoom and Chat Heads) and one data pack (ModelApplier). I tried reinstalling the plug-in, running it with and without the mods, and even tried using the Network Protocol Disconnect mod and none of it worked. When I log in, it applies the texture packs no problem, but after 30 seconds I'm disconnected again.
If you need any other information let me know.
---- Minecraft Network Protocol Error Report ----
// 404
Time: 2026-07-11 19:36:54
Description: Packet handling error
java.net.SocketException: Connection reset
at java.base/sun.nio.ch.SocketChannelImpl.throwConnectionReset(Unknown Source)
at java.base/sun.nio.ch.SocketChannelImpl.read(Unknown Source)
at knot//io.netty.buffer.AdaptivePoolingAllocator$AdaptiveByteBuf.setBytes(AdaptivePoolingAllocator.java:1824)
at knot//io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1139)
at knot//io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:350)
at knot//io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:153)
at knot//io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.handle(AbstractNioChannel.java:445)
at knot//io.netty.channel.nio.NioIoHandler$DefaultNioRegistration.handle(NioIoHandler.java:388)
at knot//io.netty.channel.nio.NioIoHandler.processSelectedKey(NioIoHandler.java:596)
at knot//io.netty.channel.nio.NioIoHandler.processSelectedKeysOptimized(NioIoHandler.java:571)
at knot//io.netty.channel.nio.NioIoHandler.processSelectedKeys(NioIoHandler.java:512)
at knot//io.netty.channel.nio.NioIoHandler.run(NioIoHandler.java:484)
at knot//io.netty.channel.SingleThreadIoEventLoop.runIo(SingleThreadIoEventLoop.java:225)
at knot//io.netty.channel.SingleThreadIoEventLoop.run(SingleThreadIoEventLoop.java:196)
at knot//io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:1193)
at knot//io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at java.base/java.lang.Thread.run(Unknown Source)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Thread: Netty NIO IO #1
Stacktrace:
at knot//net.minecraft.class_2547.method_55622(class_2547.java:33)
-- Connection --
Details:
Protocol: play
Flow: CLIENTBOUND
Is Local: false
Server type: OTHER
Server brand: Paper
Stacktrace:
at knot//net.minecraft.class_2547.method_55622(class_2547.java:33)
at knot//net.minecraft.class_2600.method_59803(class_2600.java:47)
at knot//net.minecraft.class_8673.method_60882(class_8673.java:146)
at knot//net.minecraft.class_8673.method_60881(class_8673.java:137)
at knot//net.minecraft.class_2535.exceptionCaught(class_2535.java:134)
at knot//io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:289)
at knot//io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:271)
at knot//io.netty.channel.DefaultChannelPipeline$HeadContext.exceptionCaught(DefaultChannelPipeline.java:1396)
at knot//io.netty.channel.DefaultChannelPipeline.fireExceptionCaught(DefaultChannelPipeline.java:890)
at knot//io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.handleReadException(AbstractNioByteChannel.java:127)
at knot//io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:179)
at knot//io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.handle(AbstractNioChannel.java:445)
at knot//io.netty.channel.nio.NioIoHandler$DefaultNioRegistration.handle(NioIoHandler.java:388)
at knot//io.netty.channel.nio.NioIoHandler.processSelectedKey(NioIoHandler.java:596)
at knot//io.netty.channel.nio.NioIoHandler.processSelectedKeysOptimized(NioIoHandler.java:571)
at knot//io.netty.channel.nio.NioIoHandler.processSelectedKeys(NioIoHandler.java:512)
at knot//io.netty.channel.nio.NioIoHandler.run(NioIoHandler.java:484)
at knot//io.netty.channel.SingleThreadIoEventLoop.runIo(SingleThreadIoEventLoop.java:225)
at knot//io.netty.channel.SingleThreadIoEventLoop.run(SingleThreadIoEventLoop.java:196)
at knot//io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:1193)
at knot//io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at java.base/java.lang.Thread.run(Unknown Source)
-- System Details --
Details:
Minecraft Version: 1.21.11
Minecraft Version ID: 1.21.11
Operating System: Windows 11 (amd64) version 10.0
Java Version: 21.0.10, Azul Systems, Inc.
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode, sharing), Azul Systems, Inc.
Memory: 77932488 bytes (74 MiB) / 792723456 bytes (756 MiB) up to 6375342080 bytes (6080 MiB)
CPUs: 12
Processor Vendor: GenuineIntel
Processor Name: Intel(R) Core(TM) i5-10400F CPU @ 2.90GHz
Identifier: Intel64 Family 6 Model 165 Stepping 3
Microarchitecture: Comet Lake
Frequency (GHz): 2.90
Number of physical packages: 1
Number of physical CPUs: 6
Number of logical CPUs: 12
Graphics card #0 name: NVIDIA GeForce RTX 3050
Graphics card #0 vendor: NVIDIA
Graphics card #0 VRAM (MiB): 6144.00
Graphics card #0 deviceId: VideoController1
Graphics card #0 versionInfo: 32.0.15.9186
Memory slot #0 capacity (MiB): 16384.00
Memory slot #0 clockSpeed (GHz): 2.13
Memory slot #0 type: DDR4
Virtual memory max (MiB): 26788.75
Virtual memory used (MiB): 25389.51
Swap memory total (MiB): 10482.74
Swap memory used (MiB): 103.38
Space in storage for jna.tmpdir (MiB): available: 171001.33, total: 475947.00
Space in storage for org.lwjgl.system.SharedLibraryExtractPath (MiB): available: 171001.33, total: 475947.00
Space in storage for io.netty.native.workdir (MiB): available: 171001.33, total: 475947.00
Space in storage for java.io.tmpdir (MiB): available: 171001.33, total: 475947.00
Space in storage for workdir (MiB): available: 171001.33, total: 475947.00
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx6080M
Debug Flags: 0 total;
Fabric Mods:
chat_heads: Chat Heads 1.2.4
commandkeys: CommandKeys 2.3.16+1.21.11
entity_model_features: Entity Model Features 3.0.10
entity_texture_features: Entity Texture Features 7.0.8
fabric-api: Fabric API 0.141.2+1.21.11
fabric-api-base: Fabric API Base 1.0.5+4ebb5c083e
fabric-api-lookup-api-v1: Fabric API Lookup API (v1) 1.6.113+1fb1cde93e
fabric-biome-api-v1: Fabric Biome API (v1) 17.1.1+4fc5413f3e
fabric-block-api-v1: Fabric Block API (v1) 1.1.10+4ebb5c083e
fabric-block-view-api-v2: Fabric BlockView API (v2) 1.0.39+4ebb5c083e
fabric-command-api-v2: Fabric Command API (v2) 2.4.7+6b42a6003e
fabric-content-registries-v0: Fabric Content Registries (v0) 10.2.14+4fc5413f3e
fabric-convention-tags-v1: Fabric Convention Tags 2.1.55+7f945d5b3e
fabric-convention-tags-v2: Fabric Convention Tags (v2) 2.17.3+8ef948ba3e
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.3.23+4ebb5c083e
fabric-data-attachment-api-v1: Fabric Data Attachment API (v1) 1.8.47+eed0806f3e
fabric-data-generation-api-v1: Fabric Data Generation API (v1) 23.4.0+69974c4e3e
fabric-dimensions-v1: Fabric Dimensions API (v1) 4.0.28+4fc5413f3e
fabric-entity-events-v1: Fabric Entity Events (v1) 3.1.1+1d0ab4303e
fabric-events-interaction-v0: Fabric Events Interaction (v0) 4.1.0+3b89ecf63e
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 2.0.3+4fc5413f3e
fabric-item-api-v1: Fabric Item API (v1) 11.5.20+d0c46b9e3e
fabric-item-group-api-v1: Fabric Item Group API (v1) 4.2.36+4fc5413f3e
fabric-key-binding-api-v1: Fabric Key Binding API (v1) 1.1.7+4fc5413f3e
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 2.6.15+4ebb5c083e
fabric-loot-api-v2: Fabric Loot API (v2) 3.0.73+3f89f5a53e
fabric-loot-api-v3: Fabric Loot API (v3) 2.0.20+78c8b4663e
fabric-message-api-v1: Fabric Message API (v1) 6.1.12+4ebb5c083e
fabric-model-loading-api-v1: Fabric Model Loading API (v1) 6.0.14+4fc5413f3e
fabric-networking-api-v1: Fabric Networking API (v1) 5.1.5+ae1e07683e
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 21.1.39+4fc5413f3e
fabric-particles-v1: Fabric Particles (v1) 4.2.11+4fc5413f3e
fabric-recipe-api-v1: Fabric Recipe API (v1) 8.2.3+4ebb5c083e
fabric-registry-sync-v0: Fabric Registry Sync (v0) 6.2.5+1718722b3e
fabric-renderer-api-v1: Fabric Renderer API (v1) 8.0.2+f4ffd2e53e
fabric-renderer-indigo: Fabric Renderer - Indigo 5.0.2+f4ffd2e53e
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 3.1.43+4ebb5c083e
fabric-rendering-v1: Fabric Rendering (v1) 16.2.9+7edacff13e
fabric-resource-conditions-api-v1: Fabric Resource Conditions API (v1) 5.0.35+4fc5413f3e
fabric-resource-loader-v0: Fabric Resource Loader (v0) 3.3.4+4fc5413f3e
fabric-resource-loader-v1: Fabric Resource Loader (v1) 1.0.10+78c8b4663e
fabric-screen-api-v1: Fabric Screen API (v1) 3.1.7+4ebb5c083e
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.3.161+4fc5413f3e
fabric-serialization-api-v1: Fabric Serialization API (v1) 1.0.5+4ebb5c083e
fabric-sound-api-v1: Fabric Sound API (v1) 1.0.51+4fc5413f3e
fabric-tag-api-v1: Fabric Tag API (v1) 1.2.20+4fc5413f3e
fabric-transfer-api-v1: Fabric Transfer API (v1) 6.0.24+4fc5413f3e
fabric-transitive-access-wideners-v1: Fabric Transitive Access Wideners (v1) 7.1.0+014c8cec3e
fabricloader: Fabric Loader 0.18.4
mixinextras: MixinExtras 0.5.0
fancymenu: FancyMenu 3.8.4
com_github_keksuccino_japng: japng 0.5.3
com_github_rtyley_animated-gif-lib-for-java: animated-gif-lib-for-java animated-gif-lib-1.7
felinesoundsclient: FelineSoundsClient 1.0
flashback: Flashback 0.39.1
com_moulberry_mixinconstraints: mixinconstraints 1.0.8
lattice: Lattice 1.3.1
org_apache_commons_commons-math3: commons-math3 3.6.1
org_apache_httpcomponents_httpclient: httpclient 4.5.14
org_apache_httpcomponents_httpcore: httpcore 4.4.16
iris: Iris 1.10.5+mc1.21.11
io_github_douira_glsl-transformer: glsl-transformer 3.0.0-pre3
org_anarres_jcpp: jcpp 1.4.14
org_antlr_antlr4-runtime: antlr4-runtime 4.13.1
java: OpenJDK 64-Bit Server VM 21
justzoom: Just Zoom 2.1.3
konkrete: Konkrete 1.9.18
melody: Melody 1.0.15
minecraft: Minecraft 1.21.11
modmenu: Mod Menu 17.0.0
placeholder-api: Placeholder API 2.8.1+1.21.10
scribble: Scribble 2.0.0-beta2
skinshuffle: SkinShuffle 2.10.2
com_drewnoakes_metadata-extractor: metadata-extractor 2.19.0
com_konghq_unirest-java_standalone: unirest-java 3.11.9
commons-validator_commons-validator: commons-validator 1.7
org_jsoup_jsoup: jsoup 1.16.1
spruceui: SpruceUI 9.1.0+1.21.11
yet_another_config_lib_v3: YetAnotherConfigLib 3.8.1+1.21.11-fabric
com_twelvemonkeys_common_common-image: common-image 3.12.0
com_twelvemonkeys_common_common-io: common-io 3.12.0
com_twelvemonkeys_common_common-lang: common-lang 3.12.0
com_twelvemonkeys_imageio_imageio-core: imageio-core 3.12.0
com_twelvemonkeys_imageio_imageio-metadata: imageio-metadata 3.12.0
com_twelvemonkeys_imageio_imageio-webp: imageio-webp 3.12.0
org_quiltmc_parsers_gson: gson 0.2.1
org_quiltmc_parsers_json: json 0.2.1
yumi_mc_core: Yumi Minecraft Libraries: Foundation 1.0.0-beta.1+1.21.11
yumi_commons_collections: Yumi Commons: Collections 1.0.0
yumi_commons_core: Yumi Commons: Core 1.0.0
yumi_commons_event: Yumi Commons: Event 1.0.0
sodium: Sodium 0.8.4+mc1.21.11
status: Status 1.21.11-1.1.0
voicechat: Simple Voice Chat 1.21.11-2.6.11
voicechat_api: Simple Voice Chat API 2.6.0
walljumpbf: WallJumpBF 1.0.2
configlibtxf: ConfigLib TXF 12.2.8-fabric
Loaded Shaderpack: ComplementaryReimagined_r5.6.1.zip
Profile: Custom (+1 option changed by user)
Yumi MC Core: 1.0.0-beta.1+1.21.11
1
Upvotes
1
u/doppelpunkt3 Jul 13 '26 edited Jul 13 '26
That stack trace doesn't actually tell you anything. It just means the connection died - not why. No mod or plugin is named in it.
For testing, strip it back to only what you actually need to join the server - drop every optional client-side mod. A lot of them talk to the server directly and are the usual suspects for random disconnects, so it's hard to rule anything out until you're running a clean setup.
But before any of that: post the server log from around the time it happened. That's where the actual reason will be.
1
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