TCPShield
Fabric mod that restricts incoming connections to only those from TCPShield proxies.
About this Mod
TCPShield
A simple Fabric mod to help secure your Minecraft server by blocking incoming connections unless they come from TCPShield proxies.
Features
- No Config Needed: The mod automatically fetches TCPShield proxy ranges.
- Blocks Early: Unauthorized connections are blocked at the handshake packet.
- Just works: Just drop it in and it's good to go.
How It Works
The mod pulls TCPShield proxy ranges when your server starts and blocks any incoming traffic that doesn't come from these proxies at the handshake packet.
Important Note
I'm not affiliated with TCPShield; this is just a passion project to help keep servers secure. I made it because I needed something like it and couldn't find a good option.
Support
For any issues or questions, please open a GitHub issue on the GitHub page.
Available Versions
How to Install TCPShield on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).
Install Mod
Open the mod browser in the dashboard and search for "TCPShield". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.1
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
TCPShield server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.
Is TCPShield compatible with fabric?
TCPShield officially supports fabric for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with TCPShield – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if TCPShield consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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