I'm setting up a 1.20.1 server.
I am using Forge 47.1.0.
I am using:

• NarutoMod-1.20-1.8.0-universal.jar
• SekCLib-1.20-1.0.2-universal.jar

The server console get's spammed with the following message:
NarutoMod:PacketHandler/]: Client attempted to connect with a different version of the mod. Server Version: 1.8.0 Client Version: ABSENT

This message get's spammed as soon as the server starts.
I can log into the server with a client, but the message keeps spamming.
Searched in my router if someone is trying to connect to my server, but can't find anything.

I'll have to check if this is an artifact of how the server status part is done or where it triggers from. Either I need to add an edge case for this or I need to raise a bug with forge.

Added a fix for this, will be in the next update. For some reason forge changed something which means it checks it every 5 seconds.

I seem to still be getting this log spam in the latest version

Made the fix but just got a bit busy and forgot to release it. Will be working on Naruto mod more starting in the next two weeks :)