Issues with modpack Mod rejections lost connection

Technical Support
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Operating system Linux - Debian GNU/Linux 12 on x86_64
Product Name/Version AMP ‘Callisto’ v2.5.0.8 (Mainline)
Running in container Yes

Problem Description: Having an issue saying Connection lost " Mod rejections FML modfloodlights1.4.6) FMLModbattlegear2(1.4.2) FMLModLTconstruct (1.12.18-GTNH ) I have verified that these mods are installed on my computer and I downloaded the sever version of the modpack and it matches the same version that I am on my computer

Steps to reproduce:

  • Open Minecraft instance on amp, update the java version to 8 and select forge and the correct version to match the modpack, install and update.
  • Download the server version of the modpack which can be located on their website or this link 📁 /ServerPacks locate the appropriate version and ensure it is also java 8
  • Step 3 Start the server and attempt to join.

Actions taken to resolve so far: Have attempted to create a new instance, attempted to download the regular version and not the server version of the modpack neither are working

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Assuming this is a cross-post from discord?

If not, make sure you select the correct Jar, since GTNH uses that patched forge Jar.
Also be sure to select Java 17 under Java and Memory.
Then under Additonal Java options enter -Dfml.readTimeout=180 @java9args.txt

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