nate1234

Yes, I once joined a mod server without any mods on my client. There was no error.

ok.

I also tried using LAN from a singleplayer world and using my other account to logon using 10.0.1.11:port. It had the same message. I think its my Forge Mod Loader.

Yes, but I think Forge Mod Loader is suppost to load the files up onto the client for well it is on the server.

I have installed the Forge 1.12.2 server and client. I runned the server with no mods, it worked. I added the mod "SecurityCraft" made for Forge 1.12.2, 1.12.1, and 1.12 to the server mods folder. I runned it with my client that doesn't have the mod added. It says this on the console "[19:08:39] [Netty Server IO #1/INFO] [FML]: Client protocol version 2 [19:08:39] [Netty Server IO #1/INFO] [FML]: Client attempting to join with 5 mods : [email protected],[email protected],[email protected],[email protected],[email protected] [19:08:39] [Netty Server IO #1/INFO] [FML]: Attempting connection with missing mods [securitycraft] at CLIENT [19:08:39] [Netty Server IO #1/INFO] [FML]: Rejecting connection CLIENT: [FMLMod:securitycraft{v1.8.2.3-hotfix}] [19:08:39] [Netty Server IO #1/ERROR] [FML]: Network Disconnect: Mod rejections [FMLMod:securitycraft{v1.8.2.3-hotfix}] [19:08:39] [Server thread/INFO] [net.minecraft.network.NetHandlerPlayServer]: Officer_Nate lost connection: Mod rejections [FMLMod:securitycraft{v1.8.2.3-hotfix}]" I tried duplicating the mod's .jar file, moving it to the client mod folder, and renaming it back to "SecurityCraft-Mod-1.12.1"(It works with 1.12.2) Now I can join the server with no error and use the mod with the configurations that I have already. I think it's the Forge Mod Loader default mod that is not working. latest.log