Your server is missing the other dimensions in the level.dat file. Please create a backup, maybe I'm able to fix this. There are two major kinds of portals in Minecraft: The Nether Portal and the End Portal. To make a Nether Portal, you'll need at least 10 obsidian blocks and some way to light them on fire.

Does the server itself have nether disabled, or is there any plugin slash mod that is SP only that adds something to the nether that the server does not have enabled. Can you give more details about your server, A.E server config and mods/plugins installed.

Nether portals work fine, but you need to understand how they work: - each block you walk in the nether = 8 in the overworld. - if you create a portal in the overworld, it has to be the single portal in a 1024 block radius for it to create a new portal in the nether. If two portals are closer to eachother than 1024 blocks (x-z) they will link

Why won’t my Ender Portal work. While constructing an End Portal by oneself, there are various risks to avoid. The portal should be precisely 3X3 blocks big, indicating you require 12 End Portal Frame blocks. You have to insert an Eye of Ender inside each block. It’s important that the End Portal frames face toward the centre.

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nether portal not working on server