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Posted

Hello, I started experiencing this crash a while back and have not been able to play with any recent Forge versions since. I would like to be as detailed as possible with this post as I spent quite some time iterating through Forge versions to find out where things stopped working for me.

I managed to track the issue's introduction back to Minecraft 1.19, Forge 41.0.63. Previous to this version, Minecraft was able to run fine alongside Forge.

To help demonstrate the issue, I disabled all mods besides Forge itself and ran the MultiMC launcher with several different Minecraft and Forge versions. I have attached all relevant logs below:

MC: 1.19
Forge: 41.0.61
LWJGL: 3.3.1
This version works fine, a few errors as Minecraft is loading but still works.

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MC: 1.19
Forge: 41.0.62
LWJGL: 3.3.1
This version throws a few errors on load (maybe the same/similar errors as v41.0.61), but Minecraft still manages to open and run.

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MC: 1.19
Forge: 41.0.63
LWJGL: 3.3.1
This version fails on DOWNLOAD_MOJMAPS task; "Failed to run processor: java.net.ConnectException:Connection timed out: connect".

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All subsequent Forge versions (41.0.63 onwards) fail to start and crash with same error
i.e.: MC 1.19, Forge 41.1.0

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This includes newer MC versions as well
i.e. with latest: MC 1.19.3, Forge 44.1.0

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I of course investigated a multitude of similar forum posts before deciding to post this - none of them were able to be resolved from what I saw.

In each post, someone mentioned posting a hosts file, so here is that as well to show that nothing is strange on my end:

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I hope this is able to get some traction and/or is able to be explained somehow!

Thank you.

Posted

It has to do with what you are using to connect with your ip address, either ipv4 or ipv6. From what I've been told, it's likely that one direction is blocking the ipv6 traffic, using ipv4 instead preventing the connection from occurring. As such, you need to change the settings for your device or router to either block ipv6 traffic incoming and outgoing, or don't block either.

Posted
  On 1/3/2023 at 2:59 PM, ChampionAsh5357 said:

It has to do with what you are using to connect with your ip address, either ipv4 or ipv6. From what I've been told, it's likely that one direction is blocking the ipv6 traffic, using ipv4 instead preventing the connection from occurring. As such, you need to change the settings for your device or router to either block ipv6 traffic incoming and outgoing, or don't block either.

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Thank you! I looked up ways to force ipv4 protocol for Java applications and ended up getting it to work by supplying the launcher with this jvm argument:

-Djava.net.preferIPv4Stack=true
  • 11 months later...

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