Vanilla Java Client can connect, but Bedrock will not. | GeyserMC | Page 1

cedar saffron Sep 10, 2025, 4:50 AM

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Yet another post like this. I promise I'm not dumb though.

Geyser 2.8.3-b921
Java 21
Fabric 1.21.8
Bedrock 1.21.101
Running Ubuntu on a self-hosted machine

I have a feeling it may be something to do with the reverse proxy I have set up through Amazon Web Services. Though, when I run the command inside of the EC2 "ss -lnu | grep 19132" to make sure traffic from that port can come through, everything looks fine. My dump link is below.

https://dump.geysermc.org/luAoNuS7vIJDcVhej9tJKK4JQbQxD43g

digital shuttleBOT Sep 10, 2025, 4:50 AM

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cedar saffron Yet another post like this. I promise I'm not dumb though. Geyser 2.8.3-b921 Ja...

<:geyser:723981877773598771> Geyser Fabric

Git info

Latest: Yes
Commit: 175794e
Branch: master

Platform

Fabric

Listen address

0.0.0.0:19132 (internal IP)

Remote address

***:25565

Auth type

FLOODGATE

Server version

0.17.2

Autoconfigured remote?

Yes

delicate condor Sep 10, 2025, 5:00 AM

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cedar saffron Yet another post like this. I promise I'm not dumb though. Geyser 2.8.3-b921 Ja...

If you have a reverse proxy for udp you’ll need to enable an option.

cedar saffron Sep 10, 2025, 5:00 AM

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delicate condor If you have a reverse proxy for udp you’ll need to enable an option.

What option is that?

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I'm new to this, apologies.

delicate condor Sep 10, 2025, 5:01 AM

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https://geysermc.org/wiki/geyser/understanding-the-config/

Understanding the Config | GeyserMC

This page covers basic information about the Geyser config and the function of each option.

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I don’t remember the option specifically but your welcome to look through the link above

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For the option you need

cedar saffron Sep 10, 2025, 5:01 AM

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Thanks G

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I see lemme see if that works

delicate condor Sep 10, 2025, 5:02 AM

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If you make any changes to the config

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Restart the server

cedar saffron Sep 10, 2025, 5:04 AM

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Yes sensei

cedar saffron Sep 10, 2025, 5:09 AM

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delicate condor If you make any changes to the config

Should I change "forward-hostname" to true as well?

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swift idol Sep 10, 2025, 2:00 PM

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cedar saffron Should I change "forward-hostname" to true as well?

Only if it relies on virtual hosts or forced hosts

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If it’s ALB then yes i belive

cedar saffron Sep 10, 2025, 2:26 PM

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swift idol If it’s ALB then yes i belive

Can you dumb this down for someone who doesnt pay attention in their compsci lectures

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Wait

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Its NGINX

cedar saffron Sep 10, 2025, 3:24 PM

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my config

📎 config.yml

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Additionally, I've tried setting enable-proxy-protocol and use-proxy-protocol to false but left the proxypass value to true

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It's an EC2 instance running NGINX

swift idol Sep 10, 2025, 5:42 PM

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NGINX doesn’t handle udp by default I don’t think

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stream {
server {
listen 19132 udp;
proxy_pass 127.0.0.1:19132;
}
}

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Should work

swift idol Sep 10, 2025, 5:45 PM

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cedar saffron Can you dumb this down for someone who doesnt pay attention in their compsci lec...

Bedrock Edition talks to servers using UDP, not TCP/HTTP.
• Think of TCP/HTTP like sending a letter by mail with a return address — very structured.
• UDP is like throwing a paper airplane — fast, no checks if it arrives.
2. AWS ALB / CloudFront = mail sorting machine for letters (TCP/HTTP)
• It only knows how to handle the “letters” (HTTP/TCP).
• If you throw a paper airplane (UDP) at it, it ignores it — the server never sees it.
3. Network Load Balancer (NLB) = a bucket that catches both letters and paper airplanes
• It can forward both TCP and UDP.
• So Bedrock (UDP) works if you send it through an NLB.
4. NGINX on EC2 = a mailroom that only handles letters (HTTP/TCP) by default.
• If you want it to handle paper airplanes (UDP), you need to tell it: “Hey, catch UDP too!” using stream{} blocks.

swift idol Sep 10, 2025, 5:51 PM

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cedar saffron Additionally, I've tried setting enable-proxy-protocol and use-proxy-protocol to...

enable-proxy-connections (or proxypass) tells Geyser: “I’m behind a proxy, treat the client as coming through it and expect proxy info.”

Since your NGINX isn’t configured for UDP/PROXY headers, leaving proxypass enabled confuses Geyser, and it will drop Bedrock packets — this is why clients cannot connect.

swift idol Sep 10, 2025, 6:14 PM

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I would try configing it for udp then trying

cedar saffron Sep 10, 2025, 6:33 PM

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swift idol I would try configing it for udp then trying

Thanks, gonna try this when i get home

cedar saffron Sep 10, 2025, 6:40 PM

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swift idol stream { server { listen 19132 udp; proxy_pass 127.0.0.1:191...

This is what i have in my config. Ive already confirmed its listening on that port

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And specified UDP

cedar saffron Sep 10, 2025, 7:44 PM

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Wait... does it matter that i have a few serverside mods?

delicate condor Sep 10, 2025, 7:44 PM

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Nope.

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Wouldn’t affect gameplay.

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Well networking*

cedar saffron Sep 10, 2025, 7:44 PM

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Like Toms Mobs, Friends and Foes, Farmers Delight Polymerized, Enderscape Polymerized

delicate condor Sep 10, 2025, 7:45 PM

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Should be fine.

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If they are server sided and not client sided mods

cedar saffron Sep 10, 2025, 7:45 PM

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Yeah vanilla java client can connect fine

delicate condor Sep 10, 2025, 7:45 PM

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Friends and foes might have some issues with bedrock gameplay wise probably

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If it uses entities

cedar saffron Sep 10, 2025, 7:46 PM

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Toms mobs and friends and foes introduce new mobs

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With a resource pack from polymer

delicate condor Sep 10, 2025, 7:46 PM

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Oh uh

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I believe Tom’s mod would work

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Idk about friends and foes however

cedar saffron Sep 10, 2025, 7:47 PM

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There is a polymer patch im using for it

delicate condor Sep 10, 2025, 7:47 PM

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https://modrinth.com/mod/friends-and-foes

Modrinth

Friends&Foes (Fabric/Quilt) - Minecraft Mod

Adds outvoted and forgotten mobs from the mob vote, expanding on their original concepts and adding new vanilla-like features. The mod includes: Copper Golem, Crab, Glare, Moobloom, Iceologer, Rascal, Tuff Golem, Wildfire, Illusioner, Zombie Horse

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Ah lol

cedar saffron Sep 10, 2025, 7:47 PM

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Yeah so i really am stumped with this

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Nothing is wrong with my NGINX config

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When i listen for udp on port 19132 on the EC2 i get a response

delicate condor Sep 10, 2025, 7:47 PM

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Idk 🤷 sadly I don’t have that much tech experience lol so I can’t help u in that division at least haha

cedar saffron Sep 10, 2025, 7:48 PM

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Hmmmmmm

delicate condor Sep 10, 2025, 7:48 PM

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No experience with reverse udp’s or nginx

cedar saffron Sep 10, 2025, 7:48 PM

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Escalate me to Super Hyper Extreme Support 1 Billion

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🤣

delicate condor Sep 10, 2025, 7:51 PM

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Idk 🤷

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https://tenor.com/view/cat-cat-meme-cat-typing-typing-cat-funny-cat-gif-6677769051907192566

Tenor

cedar saffron Sep 10, 2025, 7:51 PM

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Same man. Yeah that cat was me at 2:30a last night

swift idol Sep 10, 2025, 9:15 PM

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Maybe try using sudo tcpdump -n udp port 19132?

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Since ss-lnu only shows listening

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Also the address on bedrock is commented out idk if that would break it but strange

swift idol Sep 10, 2025, 9:47 PM

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It seems to be fine but yeah a dump on udp port would be great to debug if you did with proxy off and on and with that other thing off and on if you observe changes tell me or give all

digital shuttleBOT Sep 11, 2025, 9:04 PM

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Post is tagged with Answered

cedar saffron Sep 11, 2025, 9:50 PM

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Not answered yet

cedar saffron Sep 11, 2025, 9:51 PM

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swift idol It seems to be fine but yeah a dump on udp port would be great to debug if you d...

I will try this when i get a chance. Ive been busy with university

delicate condor Sep 11, 2025, 10:17 PM

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cedar saffron Not answered yet

Answered as in u got a reply :)

cedar saffron Sep 11, 2025, 10:23 PM

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Ohhh

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Silly user me

cedar saffron Sep 14, 2025, 8:14 PM

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No idea why but i believe its working...

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After migrating from a vm to proxmox

swift idol Sep 15, 2025, 2:19 PM

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cedar saffron No idea why but i _believe_ its working...

It’s not going through the aws load balancer anymore making extra proxy headers and with proxmox it uses a nat direct with no proxy weirdness

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So I’m guesssing you needed forward hostname then since the load balancer changed the headers

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Well cool it works yay

cedar saffron Sep 16, 2025, 4:28 PM

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swift idol Well cool it works yay

not quite. i am getting downstream packet errors and major desyncing issues with bedrock clients

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they can still play but its a desync of literally like 60 seconds

swift idol Sep 16, 2025, 9:22 PM

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cedar saffron not quite. i am getting downstream packet errors and major desyncing issues with...

try disabling nic offloading with ethtool -K eth0 gro off gso off tso off and make sure Make sure Proxmox’s bridge (vmbr0) and the VM’s interface are both set to use the same MTU. Try using a mtu of 13500 instead of 1400 put the vm on a bridge NIC with it’s own port if it’s not since default nat is brutal and set proxy protocol to false if you haven’t

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ip link show vmbr0 and ip link show eth0 should show mtu
ip link set dev vmbr0 mtu 1400
ip link set dev eth0 mtu 1400 can set

cedar saffron Sep 16, 2025, 9:27 PM

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Thanks, gonna try this later on

swift idol Sep 16, 2025, 9:28 PM

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Give it a public IP or a straight port-forward so the UDP packets aren’t double-NATed too btw

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Alright hope it helps

#Vanilla Java Client can connect, but Bedrock will not.