Can I disable Netherportals?

[Jammet]

-> Nether world.ini

Code:

; This is the per-world configuration file, managing settings such as generators, simulators, and spawn points

[General]
Dimension=Nether
IsDaylightCycleEnabled=1
Gamemode=1
Weather=0
TimeInTicks=9792

[Broadcasting]
BroadcastDeathMessages=1
BroadcastAchievementMessages=1

[SpawnPosition]
MaxViewDistance=12
X=128.000000
Y=130.600000
Z=272.000000
PregenerateDistance=20

[Storage]
Schema=Default
CompressionFactor=6

[Plants]
MaxCactusHeight=3
MaxSugarcaneHeight=3
IsCactusBonemealable=0
IsCarrotsBonemealable=1
IsCropsBonemealable=1
IsGrassBonemealable=1
IsMelonStemBonemealable=1
IsMelonBonemealable=0
IsPotatoesBonemealable=1
IsPumpkinStemBonemealable=1
IsPumpkinBonemealable=0
IsSaplingBonemealable=1
IsSugarcaneBonemealable=0

[Physics]
DeepSnow=1
ShouldLavaSpawnFire=1
TNTShrapnelLevel=2
WaterSimulator=Vanilla
LavaSimulator=Vanilla
SandInstantFall=0
RedstoneSimulator=Incremental

[Mechanics]
CommandBlocksEnabled=0
PVPEnabled=1
UseChatPrefixes=1

[Monsters]
VillagersShouldHarvestCrops=1
AnimalsOn=1
Types=blaze, ghast, magmacube, skeleton, zombie, zombiepigman

[LinkedWorlds]
OverworldName=world

[Generator]
Generator=Composable
BiomeGen=Constant
ConstantBiome=Nether
ShapeGen=HeightMap
HeightGen=Flat
FlatHeight=128
CompositionGen=Nether
Finishers=SoulsandRims, WormNestCaves, BottomLava, LavaSprings, NetherClumpFoliage, NetherOreNests, NetherForts, GlowStone, PreSimulator
BottomLavaHeight=30
BiomeGenCacheSize=0
NetherMaxThreshold=25000.000000
CompositionGenCacheSize=64
WormNestCavesSize=64
WormNestCavesGrid=96
WormNestMaxOffset=32
BottomLavaLevel=30
NetherFortsGridSize=512
NetherFortsMaxOffset=128
NetherFortsMaxDepth=12
PreSimulatorFallingBlocks=1
PreSimulatorWater=1
PreSimulatorLava=1

[WaterSimulator]
Falloff=1
TickDelay=5
NumNeighborsForSource=2

[LavaSimulator]
Falloff=2
TickDelay=30
NumNeighborsForSource=-1

[FireSimulator]
BurnStepTimeFuel=500
BurnStepTimeNonfuel=100
Flammability=50
ReplaceFuelChance=50000

[Seed]
Seed=1343835564

[LavaSprings]
HeightDistribution=0, 0; 30, 0; 31, 50; 120, 50; 127, 0
Chance=15

[SpawnProtect]
ProtectRadius=10

[WorldLimit]
LimitRadius=40

[Difficulty]
WorldDifficulty=1

-> Overworld world.ini

Code:

[SpawnProtect]
ProtectRadius=10

[WorldLimit]
LimitRadius=400

[Difficulty]
; WorldDifficulty=2
WorldDifficulty=0

[General]
Dimension=Overworld
IsDaylightCycleEnabled=1
Gamemode=0
Weather=1
TimeInTicks=11632

[Broadcasting]
BroadcastDeathMessages=1
BroadcastAchievementMessages=1

[SpawnPosition]
MaxViewDistance=12
X=68.000000
Y=71.600000
Z=143.000000
PregenerateDistance=20

[Storage]
Schema=Default
CompressionFactor=6

[Plants]
MaxCactusHeight=3
MaxSugarcaneHeight=3
IsCactusBonemealable=0
IsCarrotsBonemealable=1
IsCropsBonemealable=1
IsGrassBonemealable=1
IsMelonStemBonemealable=1
IsMelonBonemealable=0
IsPotatoesBonemealable=1
IsPumpkinStemBonemealable=1
IsPumpkinBonemealable=0
IsSaplingBonemealable=1
IsSugarcaneBonemealable=0

[Physics]
DeepSnow=1
ShouldLavaSpawnFire=1
TNTShrapnelLevel=2
WaterSimulator=Vanilla
LavaSimulator=Vanilla
SandInstantFall=0
RedstoneSimulator=Incremental

[Mechanics]
CommandBlocksEnabled=0
PVPEnabled=0
UseChatPrefixes=1

[Monsters]
VillagersShouldHarvestCrops=1
AnimalsOn=1
Types=wolf, bat, cavespider, chicken, cow, creeper, enderman, horse, mooshroom, ocelot, pig, sheep, silverfish, skeleton, slime, spider, squid, zombie

[LinkedWorlds]
; NetherWorldName=world_nether
; EndWorldName=world_end
NetherWorldName=world_nether
EndWorldName=world_end

[Generator]
Generator=Composable
BiomeGen=Grown
ShapeGen=BiomalNoise3D
CompositionGen=Biomal
Finishers=RoughRavines, WormNestCaves, WaterLakes, WaterSprings, LavaLakes, LavaSprings, OreNests, Mineshafts, Trees, Villages, SprinkleFoliage, Ice, Snow, Lilypads, BottomLava, DeadBushes, NaturalPatches, PreSimulator, TallGrass, Animals
BiomeGenCacheSize=64
BiomeGenMultiCacheLength=4
SeaLevel=62
BiomalNoise3DFrequencyX=40.000000
BiomalNoise3DFrequencyY=40.000000
BiomalNoise3DFrequencyZ=40.000000
BiomalNoise3DBaseFrequencyX=40.000000
BiomalNoise3DBaseFrequencyZ=40.000000
BiomalNoise3DChoiceFrequencyX=40.000000
BiomalNoise3DChoiceFrequencyY=80.000000
BiomalNoise3DChoiceFrequencyZ=40.000000
BiomalNoise3DAirThreshold=0.000000
BiomalNoise3DNumChoiceOctaves=4
BiomalNoise3DNumDensityOctaves=6
BiomalNoise3DNumBaseOctaves=6
BiomalNoise3DBaseAmplitude=1.000000
CompositionGenCacheSize=64
WormNestCavesSize=64
WormNestCavesGrid=96
WormNestMaxOffset=32
WaterLakesProbability=25
LavaLakesProbability=10
MineShaftsGridSize=512
MineShaftsMaxOffset=256
MineShaftsMaxSystemSize=160
MineShaftsChanceCorridor=600
MineShaftsChanceCrossing=200
MineShaftsChanceStaircase=200
VillageGridSize=384
VillageMaxOffset=128
VillageMaxDepth=2
VillageMaxSize=128
VillageMinDensity=50
VillageMaxDensity=80
BottomLavaLevel=10
PreSimulatorFallingBlocks=1
PreSimulatorWater=1
PreSimulatorLava=1
RoughRavinesGridSize=256
RoughRavinesMaxOffset=128
RoughRavinesMaxSize=128
RoughRavinesMinSize=64
RoughRavinesMaxCenterWidth=8.000000
RoughRavinesMinCenterWidth=2.000000
RoughRavinesMaxRoughness=0.200000
RoughRavinesMinRoughness=0.050000
RoughRavinesMaxFloorHeightEdge=8.000000
RoughRavinesMinFloorHeightEdge=30.000000
RoughRavinesMaxFloorHeightCenter=20.000000
RoughRavinesMinFloorHeightCenter=6.000000
RoughRavinesMaxCeilingHeightEdge=56.000000
RoughRavinesMinCeilingHeightEdge=38.000000
RoughRavinesMaxCeilingHeightCenter=58.000000
RoughRavinesMinCeilingHeightCenter=36.000000

[WaterSimulator]
Falloff=1
TickDelay=5
NumNeighborsForSource=2

[LavaSimulator]
Falloff=2
TickDelay=30
NumNeighborsForSource=-1

[FireSimulator]
BurnStepTimeFuel=500
BurnStepTimeNonfuel=100
Flammability=50
ReplaceFuelChance=50000

[Seed]
Seed=4711

[WaterSprings]
HeightDistribution=0, 0; 10, 10; 11, 75; 16, 83; 20, 83; 24, 78; 32, 62; 40, 40; 44, 15; 48, 7; 56, 2; 64, 1; 255, 0
Chance=24

[LavaSprings]
HeightDistribution=0, 0; 10, 5; 11, 45; 48, 2; 64, 1; 255, 0
Chance=9

[Animals]
AnimalSpawnChunkPercentage=10