Zzleables

Alright, i'm getting a little desperate here. For context, my friends and I started an MC Eternal modpack server a couple days ago. Up until now my friend has recently started getting io.netty errors and keeps disconnecting from the server. We've tried various solutions, flushing his dns, changing his dns, resetting his router, allowing java through his firewall, disabling his firewall, deleting hamachi, resetting his pc multiple times, changing the network compression threshold on the server, lowering his rendering distance etc. Here are his logs, he can connect for a couple seconds and walk around but eventually he will disconnect. Here are his logs, i've tried looking through them but i couldn't see what the problem was maybe someone else can? https://drive.google.com/file/d/1q9K38b4fUneK2DPpUxVps0tSCI7Bhxjf/view?usp=sharing