So me and a friend are trying to set up an hamachi server with Minecraft Forge, we didn't have any problems using bukkit or vanilla, but when forge was installed, problems occurred.
2012-12-10 10:09:56 [INFO] [ForgeModLoader] Forge Mod Loader version 4.5.17.479 for Minecraft 1.4.5 loading
2012-12-10 10:09:58 [INFO] [STDOUT] 208 recipes
2012-12-10 10:09:58 [INFO] [STDOUT] 27 achievements
2012-12-10 10:09:58 [INFO] [Minecraft] Starting minecraft server version 1.4.5
2012-12-10 10:09:58 [INFO] [ForgeModLoader] Attempting early MinecraftForge initialization
2012-12-10 10:09:58 [INFO] [STDOUT] MinecraftForge v6.4.1.435 Initialized
2012-12-10 10:09:58 [INFO] [ForgeModLoader] MinecraftForge v6.4.1.435 Initialized
2012-12-10 10:09:58 [INFO] [STDOUT] Replaced 84 ore recipies
2012-12-10 10:09:58 [INFO] [ForgeModLoader] Completed early MinecraftForge initialization
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Building injected Mod Containers [cpw.mods.fml.common.FMLDummyContainer, net.minecraftforge.common.ForgeDummyContainer]
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Attempting to load mods contained in the minecraft jar file and associated classes
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Found a minecraft related file at C:\Users\Vinjar\Desktop\Forge server\minecraft_server.jar, examining for mod candidates
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Skipping known library file C:\Users\Vinjar\Desktop\Forge server\lib\argo-2.25.jar
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Skipping known library file C:\Users\Vinjar\Desktop\Forge server\lib\guava-12.0.1.jar
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Skipping known library file C:\Users\Vinjar\Desktop\Forge server\lib\asm-all-4.0.jar
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Minecraft jar mods loaded successfully
2012-12-10 10:09:58 [INFO] [ForgeModLoader] Searching C:\Users\Vinjar\Desktop\Forge server\mods for mods
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Examining file minecraft_server.jar for potential mods
2012-12-10 10:09:58 [FINE] [ForgeModLoader] The mod container minecraft_server.jar appears to be missing an mcmod.info file
2012-12-10 10:09:59 [INFO] [ForgeModLoader] Forge Mod Loader has identified 3 mods to load
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Received a system property request ''
2012-12-10 10:09:59 [FINE] [ForgeModLoader] System property request managing the state of 0 mods
2012-12-10 10:09:59 [FINE] [ForgeModLoader] After merging, found state information for 0 mods
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Activating mod mcp
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Activating mod FML
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Activating mod Forge
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Verifying mod requirements are satisfied
2012-12-10 10:09:59 [FINE] [ForgeModLoader] All mod requirements are satisfied
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Sorting mods into an ordered list
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Mod sorting completed successfully
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Mod sorting data:
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLConstructionEvent to mod mcp
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLConstructionEvent to mod mcp
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLConstructionEvent to mod FML
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLConstructionEvent to mod FML
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLConstructionEvent to mod Forge
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLConstructionEvent to mod Forge
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLPreInitializationEvent to mod mcp
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLPreInitializationEvent to mod mcp
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLPreInitializationEvent to mod FML
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLPreInitializationEvent to mod FML
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLPreInitializationEvent to mod Forge
2012-12-10 10:09:59 [INFO] [ForgeModLoader] Configured a dormant chunk cache size of 0
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLPreInitializationEvent to mod Forge
2012-12-10 10:09:59 [INFO] [Minecraft] Loading properties
2012-12-10 10:09:59 [INFO] [Minecraft] Default game type: SURVIVAL
2012-12-10 10:09:59 [INFO] [Minecraft] Generating keypair
2012-12-10 10:09:59 [INFO] [Minecraft] Starting Minecraft server on 25.173.69.252:25565
2012-12-10 10:09:59 [WARNING] [Minecraft] **** FAILED TO BIND TO PORT!
2012-12-10 10:09:59 [WARNING] [Minecraft] The exception was: java.net.BindException: Cannot assign requested address: JVM_Bind
2012-12-10 10:09:59 [WARNING] [Minecraft] Perhaps a server is already running on that port?
2012-12-10 10:10:13 [INFO] [Minecraft] Stopping server
2012-12-10 10:10:13 [INFO] [Minecraft] Saving worlds
2012-12-10 10:10:13 [INFO] [STDERR] java.lang.NullPointerException
2012-12-10 10:10:13 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:361)
2012-12-10 10:10:13 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.k(MinecraftServer.java:409)
2012-12-10 10:10:13 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:544)
2012-12-10 10:10:13 [INFO] [STDERR] at fy.run(SourceFile:856)
2012-12-10 10:10:13 [INFO] [Minecraft] Stopping server
If it says " Perhaps a server is already running on that port?" make sure you only have one server running at once. Two will show that message. Also, if you are on a mac, open up Activity Monitor and delete the java program running. If you have done that, you should have no more problems.
2012-12-10 10:09:58 [INFO] [STDOUT] 208 recipes
2012-12-10 10:09:58 [INFO] [STDOUT] 27 achievements
2012-12-10 10:09:58 [INFO] [Minecraft] Starting minecraft server version 1.4.5
2012-12-10 10:09:58 [INFO] [ForgeModLoader] Attempting early MinecraftForge initialization
2012-12-10 10:09:58 [INFO] [STDOUT] MinecraftForge v6.4.1.435 Initialized
2012-12-10 10:09:58 [INFO] [ForgeModLoader] MinecraftForge v6.4.1.435 Initialized
2012-12-10 10:09:58 [INFO] [STDOUT] Replaced 84 ore recipies
2012-12-10 10:09:58 [INFO] [ForgeModLoader] Completed early MinecraftForge initialization
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Building injected Mod Containers [cpw.mods.fml.common.FMLDummyContainer, net.minecraftforge.common.ForgeDummyContainer]
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Attempting to load mods contained in the minecraft jar file and associated classes
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Found a minecraft related file at C:\Users\Vinjar\Desktop\Forge server\minecraft_server.jar, examining for mod candidates
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Skipping known library file C:\Users\Vinjar\Desktop\Forge server\lib\argo-2.25.jar
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Skipping known library file C:\Users\Vinjar\Desktop\Forge server\lib\guava-12.0.1.jar
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Skipping known library file C:\Users\Vinjar\Desktop\Forge server\lib\asm-all-4.0.jar
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Minecraft jar mods loaded successfully
2012-12-10 10:09:58 [INFO] [ForgeModLoader] Searching C:\Users\Vinjar\Desktop\Forge server\mods for mods
2012-12-10 10:09:58 [FINE] [ForgeModLoader] Examining file minecraft_server.jar for potential mods
2012-12-10 10:09:58 [FINE] [ForgeModLoader] The mod container minecraft_server.jar appears to be missing an mcmod.info file
2012-12-10 10:09:59 [INFO] [ForgeModLoader] Forge Mod Loader has identified 3 mods to load
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Received a system property request ''
2012-12-10 10:09:59 [FINE] [ForgeModLoader] System property request managing the state of 0 mods
2012-12-10 10:09:59 [FINE] [ForgeModLoader] After merging, found state information for 0 mods
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Activating mod mcp
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Activating mod FML
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Activating mod Forge
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Verifying mod requirements are satisfied
2012-12-10 10:09:59 [FINE] [ForgeModLoader] All mod requirements are satisfied
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Sorting mods into an ordered list
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Mod sorting completed successfully
2012-12-10 10:09:59 [FINE] [ForgeModLoader] Mod sorting data:
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLConstructionEvent to mod mcp
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLConstructionEvent to mod mcp
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLConstructionEvent to mod FML
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLConstructionEvent to mod FML
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLConstructionEvent to mod Forge
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLConstructionEvent to mod Forge
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLPreInitializationEvent to mod mcp
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLPreInitializationEvent to mod mcp
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLPreInitializationEvent to mod FML
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLPreInitializationEvent to mod FML
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sending event FMLPreInitializationEvent to mod Forge
2012-12-10 10:09:59 [INFO] [ForgeModLoader] Configured a dormant chunk cache size of 0
2012-12-10 10:09:59 [FINER] [ForgeModLoader] Sent event FMLPreInitializationEvent to mod Forge
2012-12-10 10:09:59 [INFO] [Minecraft] Loading properties
2012-12-10 10:09:59 [INFO] [Minecraft] Default game type: SURVIVAL
2012-12-10 10:09:59 [INFO] [Minecraft] Generating keypair
2012-12-10 10:09:59 [INFO] [Minecraft] Starting Minecraft server on 25.173.69.252:25565
2012-12-10 10:09:59 [WARNING] [Minecraft] **** FAILED TO BIND TO PORT!
2012-12-10 10:09:59 [WARNING] [Minecraft] The exception was: java.net.BindException: Cannot assign requested address: JVM_Bind
2012-12-10 10:09:59 [WARNING] [Minecraft] Perhaps a server is already running on that port?
2012-12-10 10:10:13 [INFO] [Minecraft] Stopping server
2012-12-10 10:10:13 [INFO] [Minecraft] Saving worlds
2012-12-10 10:10:13 [INFO] [STDERR] java.lang.NullPointerException
2012-12-10 10:10:13 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:361)
2012-12-10 10:10:13 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.k(MinecraftServer.java:409)
2012-12-10 10:10:13 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:544)
2012-12-10 10:10:13 [INFO] [STDERR] at fy.run(SourceFile:856)
2012-12-10 10:10:13 [INFO] [Minecraft] Stopping server