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darkecojaj may be on to something with it being a problem within forge. I too hope that this issue can be resolved if this is true. I will look into it. -EDIT- Minecraft Forge is NOT the problem. I know this because I created a fresh bukkit server on my Desktop PC, and when I tried to connect, the same exact error comes up as when I try to connect from my laptop to my Tekkit server on my Desktop PC. This error is: Failed to verify username! [internal error java.net.SocketExeption: Permission denied: connect] I have all firewalls off, Norton has been uninstalled and AVG is completely disabled. This may only happen to me, and could could very well be MCForge for darkecojaj. Either way, I really do not know how this can be resolved. I still do not know what error is given for anyone else with this problem. -EDIT 2- I have gotten it to work. All you have to do is simply go into you server.properties file and set online-mode to "false". This should allow you to join. So far I have not found any other way that works.

Mac uses its own version of java so I am not exactly sure how you are going to be able to resolve this.

The problem was not NetherOres. It was java. As I previously explained.

Use this link for the correct version of Java: http://javadl.sun.com/webapps/download/AutoDL?BundleId=65693 I have had this problem before.

I seem to have the same problem. I am running a Tekkit server on a different PC using the same internet connection. I port forwarded the IPv4 Address for the second PC in which the server is running. I have edited the properties files properly as well. When I try to connect though my IP address on my 1st PC (no server) I does not even show that it is online. It only seems to be Tekkit with this problem. I tested it with a Vanilla server and it worked flawlessly. I don't understand why it will not work.

I have found a solution for this problem. You do in fact need the newest version of Java. That being Java 7 Update 5, but you have a obtain it a certain way. This is what I did: First go to http://java.com/en/download/chrome.jsp?locale=en (assuming you are you are using Google Chrome) After you have done this, simply install Java from the file you just downloaded. Then your Tekkit server should run without errors.

Title: Tekkit 3.1.2 Server Launch Errors Version: 3.1.1 OS: Windows 7 Home Premium 64-bit Java Version: Java 7 Update 5 Description of Problem: When trying to launch the 'launch.bat' file, all that appears are a lot of errors. Error Messages: C:\Users\Administrator\Desktop\Tekkit_Server_3.1.2>java -Xmx3G -Xms2G -jar Tekkit.jar nogui 182 recipes 27 achievements 23:37:19 [iNFO] Starting minecraft server version 1.2.5 23:37:19 [iNFO] Attempting early MinecraftForge initialization 23:37:19 [iNFO] Completed early MinecraftForge initialization 23:37:19 [iNFO] Forge Mod Loader version 2.2.91.173 for Minecraft 1.2.5 loading 23:37:19 [iNFO] Loading mods from C:\Users\Administrator\Desktop\Tekkit_Server_3.1.2\mods 23:37:19 [WARNING] Failed to load mod class net/minecraft/server/mod_NetherOres.class in C:\Users\Administrator\Desktop\Tekkit_Server_3.1.2\mods\mod_NetherOres.jar 23:37:19 [sEVERE] Zip file mod_NetherOres.jar failed to read properly 23:37:19 [iNFO] File mod_NetherOres.jar contained no mods 23:37:19 [iNFO] Directory weaponmod contained no mods 23:37:19 [sEVERE] A problem has occured during mod loading. Likely a corrupt jar is located in your mods directory 23:37:19 [sEVERE] cpw.mods.fml.common.LoaderException: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0 23:37:19 [sEVERE] at cpw.mods.fml.common.Loader.load(Loader.java:436) 23:37:19 [sEVERE] at cpw.mods.fml.common.Loader.loadMods(Loader.java:606) 23:37:19 [sEVERE] at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBukkitHandler.java:134) 23:37:19 [sEVERE] at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:135) 23:37:19 [sEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438) 23:37:19 [sEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:492) 23:37:19 [sEVERE] Caused by: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0 23:37:19 [sEVERE] at cpw.mods.fml.common.Loader.loadModClass(Loader.java:527) 23:37:19 [sEVERE] at cpw.mods.fml.common.Loader.attemptFileLoad(Loader.java:562) 23:37:19 [sEVERE] at cpw.mods.fml.common.Loader.load(Loader.java:419) 23:37:19 [sEVERE] ... 5 more 23:37:19 [sEVERE] Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0 23:37:19 [sEVERE] at java.lang.ClassLoader.defineClass1(Native Method) 23:37:19 [sEVERE] at java.lang.ClassLoader.defineClassCond(Unknown Source) 23:37:19 [sEVERE] at java.lang.ClassLoader.defineClass(Unknown Source) 23:37:19 [sEVERE] at java.security.SecureClassLoader.defineClass(Unknown Source) 23:37:19 [sEVERE] at java.net.URLClassLoader.defineClass(Unknown Source) 23:37:19 [sEVERE] at java.net.URLClassLoader.access$000(Unknown Source) 23:37:19 [sEVERE] at java.net.URLClassLoader$1.run(Unknown Source) 23:37:19 [sEVERE] at java.security.AccessController.doPrivileged(Native Method) 23:37:19 [sEVERE] at java.net.URLClassLoader.findClass(Unknown Source) 23:37:19 [sEVERE] at java.lang.ClassLoader.loadClass(Unknown Source) 23:37:19 [sEVERE] at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) 23:37:19 [sEVERE] at java.lang.ClassLoader.loadClass(Unknown Source) 23:37:19 [sEVERE] at java.lang.ClassLoader.loadClass(Unknown Source) 23:37:19 [sEVERE] at java.lang.Class.forName0(Native Method) 23:37:19 [sEVERE] at java.lang.Class.forName(Unknown Source) 23:37:19 [sEVERE] at cpw.mods.fml.common.Loader.loadModClass(Loader.java:494) 23:37:19 [sEVERE] ... 7 more 23:37:19 [sEVERE] Unexpected exception cpw.mods.fml.common.LoaderException: cpw.mods.fml.common.LoaderException: java.l ang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsuppor ted major.minor version 51.0 at cpw.mods.fml.common.Loader.load(Loader.java:436) at cpw.mods.fml.common.Loader.loadMods(Loader.java:606) at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBukkitHandler.java: 134) at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:135) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438) at net.minecraft.server.ThreadServerApplication.run(SourceFile:492) Caused by: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0 at cpw.mods.fml.common.Loader.loadModClass(Loader.java:527) at cpw.mods.fml.common.Loader.attemptFileLoad(Loader.java:562) at cpw.mods.fml.common.Loader.load(Loader.java:419) ... 5 more Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(Unknown Source) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$000(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at cpw.mods.fml.common.Loader.loadModClass(Loader.java:494) ... 7 more Error Log: