Why it doesn't, I don't know. I've done it in SP multiple times, and it beams right away, - but when I do it on the server, it refuses to pull off any beams. Is there a chance a plugin, somewhere, blocks the beam of it? I've been looking through every single plugins,properties and configs, but nothing seems to be associated with beacons. I currently have Craftbook, Multiverse-Core, World Portal, WorldEdit, Worldguard, neoPaintingSwitch, BoostBlock and Fly Mode.
It isnt obvious from screenshot, are there any blocks above the beacon? it needs to be directly below sky.
..That's ridiculous. I was really hoping it was plugin related. Is there a way to change this, possibly with the help of a plugin? I'm kinda attempting to place a beacon under an ender portal UNDER the ground.
AuZor http://minecraft.gamepedia.com/Beacon#Requirements The beam is handled client side so a plugin won't help