A Nether/End portal does nothing ("dimension does not exist") — how do I fix it? — Minecraft

Q: The Nether works but the End doesn't. Same fix?

Yes — check the world_the_end folder and, on modded, that any End-related mods are installed and configured.

When a Nether or End portal lights up but sends you nowhere — sometimes with a "dimension does not exist" message — the dimension folder or its registration is missing or broken. This is usually quick to resolve.

Why this happens

Each extra dimension lives in its own world folder and needs to be enabled and registered. If the folder is missing, the setting is off, or (on modded servers) a dimension mod is absent, the portal has nowhere to send you.

How to fix it

Enable the Nether. Make sure allow-nether=true in server.properties (edit it in the Files tab).
Check the dimension folders. Confirm world_nether and/or world_the_end exist. Deleting a broken one lets the server regenerate a fresh copy on restart.
On modded servers, a dimension mod may be missing or misconfigured — check the Console for related errors and confirm the mod is in your mods folder.
Restart after any change so it takes effect.

Warning: Deleting world_nether or world_the_end regenerates that dimension from scratch — any builds there are lost. Back up first via Files/SFTP if you want to keep them.

Frequently asked questions

The Nether works but the End doesn't. Same fix? Yes — check the world_the_end folder and, on modded, that any End-related mods are installed and configured.

Do I need to delete the folder every time? No. Only regenerate a dimension if it's genuinely broken. First confirm the setting is on and the folder exists.

I'm on a modpack and portals still fail. Open a ticket with your modpack name and the Console output — a mod dependency may be missing.