The problem:
Minecraft disables IPv6 the moment the launcher runs the game.
The cause:
Incorrect use of initialization flags by the launcher when running the game in any version: -Djava.net.preferIPv4Stack=true
How to solve:
Change the flag value and add another one:
-Djava.net.preferIPv4Stack=false -Djava.net.preferIPv6Addresses=true
Making the game work with both protocols simultaneously.
This issue affects all versions of Minecraft Java(From 1.8 to recent versions.) due to an incorrect launch command. There are several reports of this problem and it was never fixed.
Related issues
duplicates
Comments
Arisa Bot
Lunarian
Duplicate of MC-15525
migrated
I understand this problem has been presented many times here. Although it was "resolved" it was not. Also it's a mess with so many threads about it.
violine1101
Thank you for your report!
We're tracking this issue in MC-212438, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as invalid. Please take a look at the parent ticket (MC-212438) and see if an explanation is provided there in the description of the ticket or in the comments for why this issue is invalid.
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