How to Update an FTB Direwolf20 Server | Safer 2026 Guide
FTB Direwolf20 runs on NeoForge (Minecraft 1.20.1, Java 17) and most update failures reported for this pack come down to two things: a partial server-pack extraction that leaves mods missing, or a client/server version mismatch — not a genuine mod conflict.
New to hosting it? The FTB Direwolf20 hosting guide covers RAM and the NeoForge install in detail. See also the FTB Direwolf20 pack page.
1. Back up before updating
ME systems, Create contraptions and automation setups are all sensitive to version drift mid-save. Take a full world backup before touching anything.
2. Download the full server pack, not individual mods
- Get the server pack for the exact target version from the FTB App or CurseForge — not the client modpack.
- Extract it into a clean folder rather than copying files over the existing install. A partial copy is the most common cause of a server that won't start, reporting missing dependencies like ComputerCraft, Mekanism or Patchouli.
- The server pack bundles the correct NeoForge version — you shouldn't need to install it separately or pick a version by hand.
3. Keep client and server versions identical
A version mismatch between client and server is the clearest explanation for a server that looks fine until someone actually tries to connect, then crashes or silently disconnects them.
Update everyone's client at the same time as the server, and don't let an old client connect to the new server version even briefly.
4. Verify Java 17 after the update
DW20 1.20.1 needs Java 17 specifically — not Java 8, not Java 21. Worth a quick check after any update, since an environment or host change can silently flip the default JVM out from under you.
FAQ
What loader does FTB Direwolf20 need?+
NeoForge on Minecraft 1.20.1 (recent editions), requiring Java 17. The server pack bundles the correct NeoForge version already, so you shouldn't need to pick it manually.
My server won't start after updating and says mods are missing — why?+
This usually means the server pack wasn't extracted fully, or files from the old version got mixed with the new one. Install the new server pack into a clean folder rather than copying files over by hand.
Why does the server crash specifically when a client connects, right after an update?+
That's the signature of a client/server version mismatch. Both sides need to be on the exact same DW20 version — not just close — or connections fail even though the server itself looks fine when nobody's joining.
Update FTB Direwolf20 on a host that gets NeoForge right
CoalHost pins the correct NeoForge build and Java 17 for DW20 automatically, and keeps backups ahead of every update.
View FTB Direwolf20 Hosting →