FTB Direwolf20 1.21 modpack Minecraft server

FTB Presents Direwolf20 1.21 is the Feed The Beast and Direwolf20 kitchen-sink pack for Minecraft 1.21.1 on NeoForge. Its page lists Ender IO, Railcraft Reborn with Steve's Carts, Minecolonies and Applied Energistics 2 with several add-ons. The Modpacks tab lists it under its Feed The Beast source, and that source installs it.

Checked against FTB Presents Direwolf20 1.21, version 1.22.0, on NeoForge 21.1.248 and Minecraft 1.21.1, October 2026.

What the pack needs

• Minecraft 1.21.1, NeoForge 21.1.248 and Java 21. These are the targets Feed The Beast lists for 1.22.0. The panel picks Java 21 for Minecraft 1.21.1, so you do not set it.
• 4 GB of RAM at least, 6 GB recommended. Those are the minimum and recommended amounts on the pack's page. Your plan sets the RAM, so read how much RAM a Minecraft server needs and check the Minecraft plans before you install.
• Room for the files. The server's share of the 1.22.0 file list, leaving out the client-only files, adds up to roughly 640 MB, before the world grows, so check Disk Analyser if the disk is tight.
• The same version for your players. The pack has many releases, and everyone needs the one your server runs. Its page is on feed-the-beast.com.

Install from the Feed The Beast source

Under Modpacks, press the Feed The Beast chip and search for Direwolf20 1.21, then press Install on FTB Presents Direwolf20 1.21. If there is no Feed The Beast chip, that source is not available on your account yet. A search for just Direwolf20 lists the older editions too, such as 1.20, 1.19 and 1.18, which are separate packs on other Minecraft versions. The version dropdown starts on 1.22.0, so pick an older release only if your players are staying on it. The panel makes the backup first, then installs the pack, and the install takes a few minutes.

Install an FTB modpack on your Minecraft server covers the rest of the window, including the backup and the start box.

First start

With 8 GB of RAM, this pack takes about three and a half minutes to reach the For help, type line on its first start.

The install writes a minimal server.properties with just the server address and port, and the server fills in the rest the first time it starts. After that start, open the Config Editor and set Player slots for the group you expect. Its help text calls View distance (chunks) the biggest lever on RAM and CPU, and Simulation distance (chunks) is cheaper to cut than view distance, so lower those first if the server struggles.

Common problems

• A player cannot join. Check they run the same pack version, on Minecraft 1.21.1 with NeoForge. Join a modded server from your launcher shows the steps.
• The install stops part way. The tab shows "The last install didn't finish" with Show install log and Retry install.
• The install window says "The backup didn't start, so nothing was changed". The window stays open, and the alert under that title gives the reason. If it is the game panel's limit on backups in 10 minutes, wait as long as it says, then hold Install and reinstall again. If every backup is protected or you are at your backup limit, open the Backups tab and delete a backup you no longer need, or remove the protection from one. Only the newest install backup stays protected: taking the next one lifts the protection from the earlier ones, so installs in a row no longer fill the slots. A backup you protected yourself keeps its protection. You can also untick Take a backup first and install without one, unless the window shows a note about your world: then the backup is required.
• The server crashes at boot. Find and read a crash report shows how to name the mod at fault. Pack bugs go to Feed The Beast's issue tracker.