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In vanilla Minecraft, is it possible to block creation of new Nether portals? This is for a Survival/Adventure hybrid map; I want the player to have a great deal of freedom, but to control access to the Nether to portals I've placed in the world. I can ask players to not build new portals, but it would be nice to have the rule mechanically enforced.

Possibilities include: somehow detecting and destroying the Nether portal blocks when they appear; not allowing the portal to be activated in the first place, and damaging the obsidian frame; somehow "tainting" any obsidian in the world or created so it's no longer eligible to be part of a port.

I'm at a loss for what a solution might look like beyond "Probably some command blocks." Trying to /testforblock every block in the world seems impractical.

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    Crazy thought, but how about making the Nether totally destroyed so someone cannot build anything in it? Like, flooding everywhere with lava, spawn a ton of Zombie Pigmen, etc. – 54D Sep 19 '15 at 7:44
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    This should definitely be doable, but it will take some command-block-fu. – MBraedley Sep 19 '15 at 11:08
  • That's not a bad fallback plan, although since I do want to use the Nether in controlled ways, the player could open a portal and end up in the area that does exist. If you mean fill it with, say, lava, then clear it for the "correct" portal, also intriguing... – Alan De Smet Sep 19 '15 at 19:23
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You should use the /fill command to replace nether portal blocks with air. You don't want this running all of the time though, only when a player uses flint and steel. First, create an objective to track when flint and steel is used:

/scoreboard objectives add usedFaS stat.useItem.minecraft.flint_and_steel

Then, run these two commands on a clock in this order to clear nether portals around the player who just used a flint and steel:

/execute @a[score_usedFaS_min=1] ~ ~ ~ /fill ~-6 ~-6 ~-6 ~6 ~6 ~6 air 0 replace portal
/scoreboard players set @a[score_usedFaS_min=1] usedFaS 0

Note that this will replace any portals nearby, so you should have something to relight the portals that you want to stay lit.

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    There are other ways to light a nether portal... – MBraedley Sep 19 '15 at 19:32
  • @MBraedley True, forgot about that. Obsidian can also be created indirectly, so I don't think it'd be completely and practically possible (without something like keeping coords/entities at where every proper portal should be) to detect and remove player-made portals. – SirBenet Sep 19 '15 at 20:37
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    That's my idea, and come to think of it, you could set a up a marker armor stand atop each valid portal, and then execute a scoreboard update for players within range of it. – MBraedley Sep 19 '15 at 20:47
  • @MBraedley Should work, might also need to also set the score for enderpearls. – SirBenet Sep 19 '15 at 21:06
  • Make sure the selector is @a[score_usedFaS_min=1,name=!username] so that the asker can place their portal without it being destroyed. Another option is @a[score_usedFaS_min=1,m=!1] so that anyone in Creative Mode can make a portal without its destruction. – haykam Aug 20 '16 at 0:45
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Removing flint and steel or obsidian from the inventory would require a simple /clear command like the following

/clear @a flint_and_steel /clear @a obsidian /clear @a fire_charge

  • Not a valid answer: portals can be casted in-place, and there are other ways to light a portal (lava, for instance) – pppery Aug 11 '18 at 18:46

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