Weird Config problem - other users can't run my pack, but I can

[Gerhard]

So, a problem I recently experienced three times involves the incorrect distribution of configuration files. I built a modpack on my computer and worked through all the conflicts until it launched properly on my computer. Afterwards, I took the mods, coremods, and config folders, and dropped them into a server which I host on my computer (I have pretty good upload so I host a Minecraft server for my buddies and I). I was able to connect to this server through both localhost and my IP address properly.

When friends of mine download the pack I built off of the Technic Platform, they fail to connect to my server due to ID mismatches - when we go into the configuration files in their modpack folder, those configurations do not match the ones I have and that I included in the pack. Something goes wrong on the transfer of files to their computers.

The strange part? If I were to delete the modpack folder from my Technic launcher and download my pack off of the Platform freshly, just like they did, I do get the proper configuration files and I can connect to the server hosted on my computer. So whatever is happening on my friends' computers that is messing up the configuration files does not happen on mine.

One of my friends is running a shitty Toshiba laptop with a 32-bit OS, and the other one is running a custom-built desktop with a 64-bit instance of Windows 7. I built the pack on a 64-bit instance of Windows 8. That's the only discrepancy that should matter between our computers - we all have the same version of Java.

This problem happened with my first custom-built pack, and thinking I screwed up somewhere in there, I built a second pack from scratch, this time testing each mod individually as I added. I resolved all conflicts and could again both start the game and connect to my server. The problem persisted to anybody who downloaded my modpack.

Then a really strange thing happened - I have a slightly modified version of the Ultimate pack on the Feed the Beast launcher - I messed with some config files and added a handful of mods. To ease the process of adding this modpack to my friends' computers and after having failed to create my own modpack, I upload the customized Ultimate pack onto the Platform. When they download it, guess what? They again fail to have the appropriate config files and cannot connect to our server which was already established and that I could connect to without issue. (The reason I strove to do this in the first place was because, for some reason, any instance of Minecraft seems to run a bit better on the Technic launcher than on the Feed the Beast launcher. No idea why, but the same pack did indeed run more smoothly for me through Technic. The friend with the shitty Toshiba can't run Ultimate through FTB, so I was hoping this oddity would help him run it on his computer.)

TL;DR: My modpack, which comes with config files, doesn't have the right configs when my friends download it. This happens even with config files from an otherwise functional modpack not assembled by me. However, when I download it, it runs just fine - even if I delete everything associated with it and re-download it.

I'm absolutely baffled as to why this is happening. The only thing I can think of is that Windows 8 does something different with those config files than previous versions of Windows, and as such I can download and play the pack fine, but the pack fails to download and include the config files properly on older versions of Windows. Other than that, this kind of weird case where the modpack works just fine on my computer but doesn't work on anybody else's just doesn't make sense to me.

[31trainman]

Are you taking your configs straight from the ones your using to run the mudpack and server?

[Gerhard]

The configs I am using are identical to the ones I run the modpack and server with, yes. I will start the server, then copy its configs, then give the modpack those configs, then download the modpack. After doing so, I am able to connect. My friends still cannot.

[31trainman]

don't do it that way use client configs on server. and use those in modpack, pm if your confused by this.

[Gerhard]

Okay so I pinpointed the problem to be some strange ID mismatch involving Gregtech and later an error involving CodeChickenCore. I don't understand the ID mismatch at all because 1. I can download this pack and use it on my computer, but my friends cannot, and 2. the files appear to be identical.

Here are the config files that my friends get on the download, the config files on my server, and the error log that my friend is getting.

http://75.186.9.194:25560/files/error_reporting/CLIENT_CONFIGS.zip (configs on the client)

http://75.186.9.194:25560/files/error_reporting/SERVER_CONFIGS.zip (configs on the server)

The two above appear to be identical.

http://75.186.9.194:25560/files/error_reporting/client_error.log (forge error log for the client)