Fix Server Errors

Common Server Errors (And How to Fix Them Fast)

Most “server is broken” issues fall into a few categories: connection/ports, version mismatch, missing files, or mod/plugin problems. Here’s a quick guide to diagnose and fix the most common ones.

“If it worked yesterday and not today: check updates, mods, and configs first.”

1) “Can’t connect / Timed out”

Usually one of these:

• Wrong IP/Port: confirm the exact address from your panel.
• Server is offline: check console/logs and restart if needed.
• Firewall/port closed: ensure the game port is open (panel/network rules).
• External service issue: some games rely on Steam/EOS — try again later.

2) “Outdated client / Version mismatch”

Match versions exactly (game + mod loader + modpack). For Minecraft modded: client and server must share the same loader and mod set.

3) “Missing mods” / “Incompatible mod set”

This happens when:

• Client has extra mods not on the server (or vice versa).
• Different mod versions (same mod name, different build).
• Dependencies missing (libraries required by another mod).

Fix: make your modpack a “single source of truth” and update both sides together.

4) Crash on startup

Read the last lines of the log:

• Java version errors: server needs a different Java runtime.
• Missing files: wrong folder structure or incomplete upload.
• Loader/Mixin errors: wrong Forge/Fabric version or broken mod.

5) Lag / rubberbanding

If players rubberband:

• High entity count (mobs/items) or too much chunk loading.
• View distance too high for your plan/player count.
• Worldgen while exploring (CPU spikes).

Tip: See our performance guide: Reduce Lag.

Quick checklist (copy/paste)

✅ Server running?
✅ Correct IP:Port?
✅ Game version matches?
✅ Mods/plugins match?
✅ Check last 30 lines of logs?
✅ Try clean restart?

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