First reported over xJon/Hexxit-II#230:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
https://mclo.gs/d7kVwP0#L71

This is using version 1.5, and has been reported by players who ran the modpack and mod before.

Could you send me your game log?

latest.log

Could you send me your game log?

Lol I noticed, why it says 1.3

I can't delete the file because my launcher loads it again :( Modpack in TLauncher. You should ask someone else to help XD

I just published version 1.5.1 on Github with a changed URL for the remote config.
Could you please check if that resolves the issue on your end as well?

I don't think I can check this out. That's not me holding a server. I can change it on my side but I don't think it's gonna work

Updating it only on the client side should work just fine

I deleted that config file and changed to new version and... Nope, it doesn't work

I just published version 1.5.1 on Github with a changed URL for the remote config. Could you please check if that resolves the issue on your end as well?

I don't think I can check this out. That's not me holding a server. I can change it on my side but I don't think it's gonna work

I don't think I can check this out. That's not me holding a server. I can change it on my side but I don't think it's gonna work

Updating it only on the client side should work just fine

I have the same problem, Minecraft version 1.12.2, Mod version 1.3

serializationisbad.json
I put this file into config folder, it works

serializationisbad.json I put this file into config folder, it works

Confirmed it works for me too. Thanks Eva

It looks like Github changed their SSL certificate on the raw.githubusercontent.com domain to a new one which isn't trusted in very old Java versions (8u51 in this case).

SiB downloads its config from there if there isn't one locally in the config directory:

• either serializationisbad.json
• (Versions >= 1.5) or the serializationisbad-remotecache.json which gets created after a successful download from Github

I'm currently looking for another reliable static file host where I can upload the config file to, which also has a certificate that is trusted by ancient Java versions.

In the meantime, like @EvaLinn already mentioned, adding the file manually to the config directory works as a workaround.

EDIT: Currently evaluating if Cloudflare R2 would be a viable option, but due to maintenance on their end, that may take a bit of time

I can't delete the file because my launcher loads it again :( Modpack in TLauncher. You should ask someone else to help XD

You should update the SerializationIsBad mod to 1.5.1. If your launcher doesn't allow you to do this, there is nothing we can do on our end. (Considering that you're using an illegal cracked version of the game, you should probably just buy the game and use another launcher)

I can't delete the file because my launcher loads it again :( Modpack in TLauncher. You should ask someone else to help XD

You should update the SerializationIsBad mod to 1.5.1. If your launcher doesn't allow you to do this, there is nothing we can do on our end. (Considering that you're using an illegal cracked version of the game, you should probably just buy the game and use another launcher)

I have license, but I don't like official Minecraft Launcher. It's much easier for me to make modpacks in TLauncher. And yeah, it doesn't allow me to update the mod

I have license, but I don't like official Minecraft Launcher. It's much easier for me to make modpacks in TLauncher. And yeah, it doesn't allow me to update the mod

Then use something like Prism Launcher. TLauncher is illegal and is known for stealing legitimate accounts.
There's also the official Modrinth and Curseforge launchers.

If you already have a serializationisbad.json in your config folder, try deleting that before starting the game.

@dogboy21 Resetting it appears to work 🎉

@dogboy21 Replacing 1.5 with 1.5.1 does not appear to work - https://mclo.gs/zthspOM

Alright, then I know what the issue is, thank you for testing!
The old config URL was still present in that config, so there was pretty much no difference with the 1.5.1 version.
I will release a new version 1.5.2 later today which replaces that old URL as well, so it also should work for older instances with the old config.

1.5.2, which replaces the old URL with the new one, is now released as well :)
Will also upload it to CF/Modrinth in a few minutes

@dogboy21 I can confirm it works :)

Alright, thank you for testing!

If you're currently using version 1.4 or above, setting remoteConfigUrl in the config to https://serializationisbad.dogboy.io/serializationisbad.json should be enough.
Otherwise update to 1.5.2 which already has that fix builtin.
Deleting the config file isn't neccessary with 1.5.2.

Hey, sorry for the dumb question, but do I need to update the mod or just delete the mod config ? Thanks!

Perfect! Thanks