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Minecraft: installing a ready-made modpack (CurseForge, Modrinth, MultiMC)

How to move a modpack to the server, which mods to remove and what to do if players get kicked when joining.

1. Check the version

In your launcher, check the Minecraft version and the modpack's loader (for example, NeoForge 21.1.251 for 1.21.1). Install the same core and the same version in the "Mods and plugins" section.

2. What to upload

From the modpack folder on your computer you only need:

  • mods: the mods;
  • config: mod settings;
  • defaultconfigs, kubejs, scripts, if the modpack has them.

Not needed: saves, screenshots, resourcepacks, shaderpacks, options.txt, logs. Upload a large modpack over SFTP (see the guide "Files and SFTP") or as a single archive through "Files" → unarchive.

If the modpack has a separate server pack (Server Pack on the modpack page), use it: client-side mods are already removed there.

3. Remove client-side mods

Graphics and UI mods crash on the server. Move them from mods to the mods-client-only folder:

OptiFine, Sodium, Embeddium, Rubidium, Iris, Oculus, Entity Culling, Dynamic FPS, FPS Reducer, 3D Skin Layers, Better F3, Zoomify, Controlling, Mouse Tweaks, Legendary Tooltips, Ding, ReAuth, SmoothFont, VaultPatcher, TXLoader, Sound Physics, Ambient Sounds.

Not sure? Start the server: if it crashes, a hint with the culprit's name appears above the console.

4. Memory

A modpack with 100+ mods needs at least 6 GB. If the server crashes with "Out of memory", upgrade your plan's memory.

Players get kicked with "Timed out" when joining

The player's game takes too long to process the mod data and the server drops the connection. What helps:

  1. For the player: give the game more memory in the launcher: CurseForge → Settings → Minecraft → Java Settings → Allocated Memory 6–8 GB.
  2. On the server: the Packet Fixer mod (it increases the timeout). Players don't have to install it.

A player can't join: "Mismatched mod list"

The player and the server have different mods or versions. Shared mods must be identical. The most reliable way is for everyone to play the exact same modpack version.