Minecraft Forums

Hello everyone. I have been wanting to do something VERY simple. I want to play a modded minecraft through a VPN with my buddy in another state or with the minecraft server. When I use the VPN, I open the game to LAN and there is no IP address being shown in the minecraft console. By every tutorial I could find, you were supposed to change the IPV4 advanced properties Interface metric to 1. When I do this, my buddy can see the game he will get an error saying he cannot login and he should restart the game. No matter how many times he restarts it, it will say the same thing. When we try via server we got the same error UNTIL i turned online mode to FALSE. When I did that, we could connect to a vanilla server just fine. Issue was, When I tried to run the FORGE server with a start.bat using forge-1.7.2-10.12.2.1147-universal.jar, it would open a cmd window and immediately close. To be able to read the text, I added pause to the start.bat. this is what was said...

C:\Users\Tracy\Desktop\syudaiuy>java -jar forge.jar -Xmx3G
[09:21:24] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.co
mmon.launcher.FMLServerTweaker
[09:21:24] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.
fml.common.launcher.FMLServerTweaker
[09:21:24] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.
launcher.FMLServerTweaker
[09:21:24] [main/INFO] [FML]: Forge Mod Loader version 7.2.217.1147 for Minecraf
t 1.7.2 loading
[09:21:24] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version
1.8.0_65, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jr
e1.8.0_65
[09:21:25] [main/WARN] [FML]: The coremod mods.battlegear2.coremod.BattlegearLoa
dingPlugin does not have a MCVersion annotation, it may cause issues with this v
ersion of Minecraft
[09:21:25] [main/WARN] [FML]: The coremod aroma1997.core.coremod.CoreMod does no
t have a MCVersion annotation, it may cause issues with this version of Minecraf
t
[09:21:25] [main/WARN] [FML]: The coremod net.malisis.core.asm.MalisisCorePlugin
does not have a MCVersion annotation, it may cause issues with this version of
Minecraft
[09:21:25] [main/INFO] [FML]: Loading tweaker optifine.OptiFineForgeTweaker from
OptiFine_1.7.2_HD_U_C2.jar
[09:21:25] [main/WARN] [FML]: The coremod com.cheeseum.pistoneverything.PistonEv
erythingLoadingPlugin does not have a MCVersion annotation, it may cause issues
with this version of Minecraft
[09:21:25] [main/INFO] [FML]: Loading tweaker shadersmodcore.loading.SMCTweaker
from ShadersModCore-v2.3.30-mc1.7.2-f.jar
[09:21:25] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.co
mmon.launcher.FMLInjectionAndSortingTweaker
[09:21:25] [main/INFO] [LaunchWrapper]: Loading tweak class name optifine.OptiFi
neForgeTweaker
[09:21:25] [main/INFO] [LaunchWrapper]: Loading tweak class name shadersmodcore.
loading.SMCTweaker
[09:21:25] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.co
mmon.launcher.FMLDeobfTweaker
[09:21:25] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.
launcher.FMLInjectionAndSortingTweaker
[09:21:25] [main/ERROR] [LaunchWrapper]: Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.
8.0_65]
at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_65]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwra
pper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrappe
r-1.9.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0
_65]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0
_65]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.8.0_65]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_65]
at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.j
ava:43) [forge.jar:?]
at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.
java:12) [forge.jar:?]

C:\Users\Tracy\Desktop\syudaiuy>pause
Press any key to continue . . .

My universal jar was renamed to forge.jar for convenience with the start.bat. I have searched through many MANY forums for many hours last night and all I wanna do is play minecraft mods with my buddy. can someone please help?

Is no one seriously going to answer?

Sorry I can't help. I just read through your error log and the actual error that caused the crash doesn't contain any keywords that help me figure out what went wrong.

I would suggest as an idea, why not (temporarily) remove all mods and see if you can get it running with just forge on both your systems. Offline mode should not be necessary.

Legacy java fixer worked for the server. thanks a million for that! With the LAN, anyone have ideas?