FleiSync

Automatic mod sync for Minecraft servers — no central service.

FleiSync runs on the server. It answers on the normal game port (no extra port, no port forwarding) and lists the installed mods. The FleiLauncher client only needs the server IP and then syncs mods, Minecraft version and loader fully automatically — directly client ↔ server, with no FleiTec service in between.

Supported

Tested on real dedicated servers (started, manifest answered, normal player connections unaffected):

• Fabric 1.16.1 – 26.3 (every release in between)
• Quilt 1.20.1, 1.21.1, 26.1
• NeoForge 1.20.4 – 26.2
• Forge 1.18.2 – 26.2

One jar per loader — the same jar works on all listed versions.

How it works

• GET /fleisync/manifest — mod list with hashes, Minecraft version, loader + version
• GET /fleisync/mods/<file> — the mod files
• Everything else on the port stays normal Minecraft traffic
• No account, no central server, no telemetry

Note

Pure server-side mod. Do not install it on the client — the FleiLauncher handles the sync there.