Disconnect Packet Fix in FTB StoneBlock 4

Same as in the FTB Skies 2 1.22.0 guide

Disconnect Packet Fix is a tiny background mod that you never interact with directly. It works around the Mojang bug MC-271325 on Fabric and NeoForge servers. That bug fills the server console with long exception stacktraces, usually headed by "Error sending packet clientbound/minecraft:disconnect".^[1]

What it does

The mod is a stopgap until Mojang fixes the bug itself. It is extremely minimal and uses a single mixin to inject code into one method. It adds no items, blocks or recipes that the sources describe.^[1]

Who it is for

It is aimed at server hosts and anyone running a dedicated server. If you read your console logs while troubleshooting, this mod keeps the disconnect error spam from burying the messages that matter. If you only play and never look at server logs, you can safely ignore it.^[1]

In this pack

The pack ships Disconnect Packet Fix 2.0.1, using the NeoForge build of the mod. It is bundled for you, so there is nothing to install or craft.^[2]

The mod is licensed under the MIT License.^[1]

Unverified The sources I was given contain no quest, guidebook, config or progression information for this mod, and it is not on the ATM Star path. Treat it as a quiet fix that runs in the background, not as something to unlock or work toward.

Same as in the FTB Skies 2 1.22.0 guide

Good news: there's nothing to craft or set up for this one. Disconnect Packet Fix is a background fix, so you won't be building a first item or following a starter quest chain with it.^[1]

The mod is made for Fabric and NeoForge-based Minecraft servers. It works around the Mojang bug MC-271325, which can flood a server console with exception stack traces.^[1]

What the bug looks like

The error you'd see in the console is "Error sending packet clientbound/minecraft:disconnect", followed by an EncoderException saying it is sending an unknown packet 'clientbound/minecraft:disconnect'. The mod's job is to work around this, so those stack traces stop spamming the console.^[1]

What to do first

1. Make sure you're looking at the server side. The mod is described as a server mod, so the console of the server you host is where you'd notice its effect.^[1]
2. If you ever see that disconnect-packet error in your logs, this is the mod that deals with it. You don't need to touch anything to enable it.^[1]
3. Carry on with the rest of the pack. The mod is MIT licensed, and nothing in its project description asks you to configure it.^[1]

Unverified I couldn't confirm any items, recipes, quests or config options for this mod in this pack, so there's no crafting order to follow. If you find any in-game, let John know.

Same as in the FTB Skies 2 1.22.0 guide

This one is a bit different from the other mods in the pack. There are no machines, multiblocks, power networks or fluid and item handling to learn here. Disconnect Packet Fix is a server-side bug workaround, and the only "mechanic" is the fix it applies behind the scenes.^[1]

What problem it solves

The mod works around the Mojang bug MC-271325 on Fabric and NeoForge servers. That bug frequently spams the server console with exception stacktraces. The error you'd see is "Error sending packet clientbound/minecraft:disconnect", with an exception saying it is sending an unknown packet of that type.^[1]

If you run a server and your console keeps filling with that error, this mod is the reason it gets cleaned up.^[1]

How it works

The mod is extremely minimal. It uses a single mixin to inject code into one method. It is meant to fix the problem until Mojang fixes the bug itself.^[1]

Unverified The available sources don't describe any items, blocks, recipes, quests or config options for this mod in the pack, so there is nothing further to configure or craft. Any extra behaviour beyond the bug workaround is unverified.

FTB StoneBlock 4 1.21.0 ships Disconnect Packet Fix 2.0.1. The mod list shows it was first included in FTB StoneBlock 4 1.0.3 or earlier.^[3]

2.0.1: the hot-fix

This is the release your pack uses, and it is a small one. In 2.0.0, NeoForge refused to load the mod because its ID contained disallowed characters (dashes).^[4]

The only change between 2.0.0 and 2.0.1 is the NeoForge mod ID, which went from disconnect-packet-fix to disconnect_packet_fix.^[4]