diff --git a/src/main/java/cpw/mods/fml/common/network/handshake/NetworkDispatcher.java b/src/main/java/cpw/mods/fml/common/network/handshake/NetworkDispatcher.java
index 139cbd9..4b9648a 100644
--- a/src/main/java/cpw/mods/fml/common/network/handshake/NetworkDispatcher.java
+++ b/src/main/java/cpw/mods/fml/common/network/handshake/NetworkDispatcher.java
@@ -155,7 +155,9 @@
 		// Return the dimension the player is in, so it can be pre-sent to the client in the ServerHello v2 packet
 		// Requires some hackery to the serverconfigmanager and stuff for this to work
 		
-		//Disabled by UltraMine - no IO operations in main thread
+		// Disabled by UltraMine - no IO operations in main thread
+		// Support for more than 256 dimension ids implemented in ServerConfigurationManager.initializeConnectionToPlayer_body
+		// by sending additional S07PacketRespawn packet.
 		return 0;
 		/*
 		NBTTagCompound playerNBT = scm.getPlayerNBT(player);
diff --git a/src/main/java/net/minecraft/server/management/ServerConfigurationManager.java b/src/main/java/net/minecraft/server/management/ServerConfigurationManager.java
index a010339..32c6d89 100644
--- a/src/main/java/net/minecraft/server/management/ServerConfigurationManager.java
+++ b/src/main/java/net/minecraft/server/management/ServerConfigurationManager.java
@@ -157,7 +157,10 @@
 		ChunkCoordinates chunkcoordinates = worldserver.getSpawnPoint();
 		this.func_72381_a(p_72355_2_, (EntityPlayerMP)null, worldserver);
 		p_72355_2_.playerNetServerHandler = nethandlerplayserver;
-		nethandlerplayserver.sendPacket(new S01PacketJoinGame(p_72355_2_.getEntityId(), p_72355_2_.theItemInWorldManager.getGameType(), worldserver.getWorldInfo().isHardcoreModeEnabled(), worldserver.provider.dimensionId, worldserver.difficultySetting, this.getMaxPlayers(), worldserver.getWorldInfo().getTerrainType()));
+		boolean isLongDimId = p_72355_2_.dimension != (byte)p_72355_2_.dimension;
+		nethandlerplayserver.sendPacket(new S01PacketJoinGame(p_72355_2_.getEntityId(), p_72355_2_.theItemInWorldManager.getGameType(), worldserver.getWorldInfo().isHardcoreModeEnabled(), isLongDimId ? 0 : worldserver.provider.dimensionId, worldserver.difficultySetting, this.getMaxPlayers(), worldserver.getWorldInfo().getTerrainType()));
+		if(isLongDimId)
+			nethandlerplayserver.sendPacket(new S07PacketRespawn(p_72355_2_.dimension, worldserver.difficultySetting, worldserver.getWorldInfo().getTerrainType(), p_72355_2_.theItemInWorldManager.getGameType()));
 		nethandlerplayserver.sendPacket(new S3FPacketCustomPayload("MC|Brand", this.getServerInstance().getServerModName().getBytes(Charsets.UTF_8)));
 		nethandlerplayserver.sendPacket(new S05PacketSpawnPosition(chunkcoordinates.posX, chunkcoordinates.posY, chunkcoordinates.posZ));
 		nethandlerplayserver.sendPacket(new S39PacketPlayerAbilities(p_72355_2_.capabilities));
diff --git a/src/main/java/org/ultramine/server/world/MultiWorld.java b/src/main/java/org/ultramine/server/world/MultiWorld.java
index a0b6a1e..4b2f46c 100644
--- a/src/main/java/org/ultramine/server/world/MultiWorld.java
+++ b/src/main/java/org/ultramine/server/world/MultiWorld.java
@@ -298,8 +298,6 @@
 		int dim = -2;
 		while(getDescByID(dim) != null || DimensionManager.isDimensionRegistered(dim))
 			dim--;
-		if(dim < -128)
-			throw new RuntimeException("Not enough free dimension IDs");
 		return dim;
 	}