BufferFix
by Xav101
BufferFix is a Forge coremod for 1.4.7 servers that raises the packet send queue limit, so players joining a crowded machine area are no longer disconnected with disconnect.overflow.
What it does
Some 1.4.7 servers drop players with a disconnect.overflow error. The error is most common where a large number of machines sit in one location. Minecraft's TcpConnection.java processReadPackets method checks how large the send queue for a user has grown, and a queue above 2MB causes the server to drop that player's connection.
BufferFix patches that check so the server allows a send queue of up to 20MB. A player who joins an area with many machines and fills the queue past 2MB stays connected. The change applies on the server only, so a server owner installs it and players need nothing extra.
Files are published for Forge only and target 1.4.7 alone. The mod is released under the Apache License 2.0, and the code is not open source.
Key features
Queue limit raised to 20MB
The patched server accepts a per-player send queue of up to 20MB instead of dropping the connection at 2MB.
Overflow disconnect fix
Players joining an area with many machines are no longer disconnected by the disconnect.overflow error.
Server-only patch
Only the server runs the coremod, so clients connect without any change on their side.
Targets the TcpConnection check
The patch works on the size check in TcpConnection.java, the point where the server decides to drop an overfull queue.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Crowded machine bases
A server with large machine builds in one place, where many items and signals are sent to each player at once.
Small private servers
Owners of small 1.4.7 servers who see players dropped with disconnect.overflow can install the coremod without changing any other setup.
Who it’s for: Server owners running Minecraft 1.4.7 Forge servers where players are disconnected with the disconnect.overflow error, especially in areas with many machines.
How it compares
Health Overflow Fix covers a different overflow, is for 1.20.1 and runs on client and server together. StaciaHelper is server-side only and open source under the MIT License, but it targets 1.16.5 and does not change the send queue. Allow Disconnect is a client-side mod for 1.8.9 – 1.21.11 and is not a server fix.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| BufferFix | Forge | 1.4.7 | Server-side only | 2024-08-22 |
| Health Overflow Fix | Forge | 1.20.1 | Client and server | 2026-08-31 |
| StaciaHelper | Forge | 1.16.5 | Server-side only | 2021-03-03 |
| Allow Disconnect | Fabric and Forge | 1.8.9 – 1.21.11 | Client-side only | 2026-03-08 |
Questions
Does BufferFix need to be installed on clients?
Which Minecraft version does BufferFix support?
Does BufferFix fix every disconnect on a server?
In the catalog
BufferFix is one of 36,990 Utility mods on ModsFinder, and one of 14,575 Utility mods for Forge. 178 mods support Minecraft 1.4.7.
Similar mods
What the author says
This server-side coremod fixes the disconnect.overflow error that players might get on some 1.4.7 servers, most often caused by having a large amount of machines in one location. The cause of this problem is a check in Minecraft's TcpConnection.java#processReadPackets() method where the server checks the size of the…
Official listing
- Modrinth page
- modrinth.com/mod/bufferfix
- Owner
- Xav101
- Published
- 2024-08-22
- Updated on Modrinth
- 2024-08-22
- Facts verified
- 2026-10-15