Java Community | Help. Code. Learn.•12mo ago

server only running on IPv6

my mine minecraft server is only running on IPv6 and i want it to run on IPv4 (tryed using

-djava.net.preferIPv4Stack=true

-djava.net.preferIPv4Stack=true

it worked for a day and thats it)

JavaBot•1/9/25, 5:12 PM

This post has been reserved for your question.

Hey @switce! Please use
/close
/close
or the button above when your problem is solved. Please remember to follow the help guidelines. This post will be automatically marked as dormant after 300 minutes of inactivity.

TIP: Narrow down your issue to simple and precise questions to maximize the chance that others will reply in here.

dan1st•1/9/25, 5:29 PM

Are you saying the server itself doesn't allow IPv4 connections or do you mean these aren't routed to your computer?

dan1st•1/9/25, 5:29 PM

If you want to use IPv4 to connect to your computer from another network, you have to do some setup things

Ddan1st If you want to use IPv4 to connect to your computer from another network, you ha...

switceOP•1/9/25, 5:39 PM

how

switceOP•1/9/25, 5:44 PM

like the server wont run on IPv4 and only IPv6
my domain requires IPv4

Sswitce like the server wont run on IPv4 and only IPv6 my domain requires IPv4

dan1st•1/9/25, 5:59 PM

What makes you think so?

Ddan1st What makes you think so?

switceOP•1/9/25, 5:59 PM

see image

dan1st•1/9/25, 5:59 PM

The image doesn't show anything except that the combination of IP and port is not reachable from whereever that checker is running

dan1st•1/9/25, 6:00 PM

Where are you running the server?

Ddan1st Where are you running the server?

switceOP•1/9/25, 6:00 PM

im running the server on my pc

switceOP•1/9/25, 6:00 PM

port forward it

switceOP•1/9/25, 6:00 PM

dan1st•1/9/25, 6:01 PM

When you open Minecraft on your PC and try to connect to "127.0.0.1:25565", what happens?

Ddan1st When you open Minecraft on your PC and try to connect to "127.0.0.1:25565", what...

switceOP•1/9/25, 6:01 PM

puts me in the server

dan1st•1/9/25, 6:02 PM

that means the server runs with IPv4

dan1st•1/9/25, 6:02 PM

so port forwarding (or possibly your firewall) is the issue

dan1st•1/9/25, 6:02 PM

Do you have another device with Minecraft in the same network?

Ddan1st that means the server runs with IPv4

switceOP•1/9/25, 6:03 PM

but when i use my public IPv4 it wont work but when i use my public IPv6 it works

Ddan1st Do you have another device with Minecraft in the same network?

switceOP•1/9/25, 6:03 PM

yes

Sswitce but when i use my public IPv4 it wont work but when i use my public IPv6 it work...

dan1st•1/9/25, 6:04 PM

As I said, probably port forwarding, firewall or using the wrong IP

Sswitce yes

dan1st•1/9/25, 6:04 PM

Can you connect to the server from that device using the private IPv4 address of the server?

Ddan1st Can you connect to the server from that device _using the private IPv4 address o...

switceOP•1/9/25, 6:05 PM

yes

Sswitce Click to see attachment

dan1st•1/9/25, 6:05 PM

Does that thing also show an IP address?

Sswitce yes

dan1st•1/9/25, 6:05 PM

So that part works?

dan1st•1/9/25, 6:05 PM

then it's the port forwarding that doesn't work

Ddan1st Does that thing also show an IP address?

switceOP•1/9/25, 6:06 PM

private yes

Sswitce my mine minecraft server is only running on IPv6 and i want it to run on IPv4 (t...

dan1st•1/9/25, 6:07 PM

I assume you entered your public IP there?

Sswitce private yes

dan1st•1/9/25, 6:07 PM

and it is the private IP of the server, right?

Ddan1st I assume you entered your public IP there?

switceOP•1/9/25, 6:08 PM

private

switceOP•1/9/25, 6:08 PM

dan1st•1/9/25, 6:08 PM

well that cannot work

dan1st•1/9/25, 6:08 PM

you need to enter your public IP in the IP checker

dan1st•1/9/25, 6:09 PM

the server isn't available from other networks by its private IP

dan1st•1/9/25, 6:09 PM

btw it's possible that someone else already port forwards port 25565 blocking you from doing that

Ddan1st well that cannot work

switceOP•1/9/25, 6:10 PM

wait no no

switceOP•1/9/25, 6:10 PM

i put my public in the tester

dan1st•1/9/25, 6:10 PM

Can you test forwarding a different port to 25565?

dan1st•1/9/25, 6:10 PM

Ideally a random port

dan1st•1/9/25, 6:11 PM

for example 36736

dan1st•1/9/25, 6:11 PM

idk just a random number nobody else would have picked

Ddan1st btw it's possible that someone else already port forwards port 25565 blocking yo...

switceOP•1/9/25, 6:11 PM

on my network?

Sswitce on my network?

dan1st•1/9/25, 6:11 PM

no, in another network

dan1st•1/9/25, 6:12 PM

Like your ISP probably uses the same public IP for multiple networks/houses

dan1st•1/9/25, 6:12 PM

like maybe your neighbors or whatever have the same IP and also do port forwarding with that port (or have it configured)

Ddan1st like maybe your neighbors or whatever have the same IP and also do port forwardi...

switceOP•1/9/25, 6:14 PM

so i change the server port and change the port forward port?

switceOP•1/9/25, 6:15 PM