Multiplayer suddenly not working

[xnnox70]

Operating System

Windows 11

Description of bug

Tried joining on a server after days of not playing. I try to join, but there's an error "Invalid signature for public profile key" shows up, and tells me to restart the game. I tried logging off and on, reinstalling the client to no avail. I thought this wasn't the launcher's issue, however, this didn't happen on another launcher I used.

Steps to reproduce

• Run instance
• Multiplayer>>join server>>connect
• "Invalid signature for public profile key"

Suspected cause

No response

This issue is unique

• I have searched the issue tracker and did not find an issue describing my bug.

[Cyimil]

It seems that since 1.19.1 was launched, UltimMC started having this problem...

[MenacingPerson]

From authlib injector notes:

This update contains breaking changes that require both server and client to use v1.2.0 and above of authlib-injector!

If you encounter the Invalid signature for profile public key. Try restarting your game. error when entering the server, please make sure that the authlib-injector version of the server and client is v1.2.0 or above.

If your server version is 1.19 or above, please modify server.properties and modify enforce-secure-profile to true!

     [Fix] Fixed a warning that chat messages were not signed in MC 1.19.1

Linked pull request: #172
Build number: 48

I think ultimmc devs have to fix

[jwaxy]

I have the same error with Linux.

[jwaxy]

I fixed the problem with using Wurst Client's nochatreports and noencryption modules.

[sedub01]

Yeah, I have that problem too but people around me say there's no errors
Hope devs will fix this asap

[Ar7hurz1nh0]

I was having the same issue, so I jumped in and tried fixing it myself, even if it was a temporarily solution. I'm linking my pull request that solves it (#241)

[Neptune650]

I see and can understand this issue, the cause is that is likely the server you're trying to connect to doesn't have that option enabled, please ask the server manager to do so.

[Neptune650]

This happens because UltimMC always uses the latest version, but the server may not.

[Ar7hurz1nh0]

As a server owner, I have disabled enforce-secure-profile on server.properties, and force-key-authentication on velocity.toml. But it seems that velocity in specific has some kind of bug that doesn't allow connections even with it disabled. The
PR linked solves that problem.

[jwaxy]

As a server owner, I have disabled enforce-secure-profile on server.properties, and force-key-authentication on velocity.toml. But it seems that velocity in specific has some kind of bug that doesn't allow connections even with it disabled. The PR linked solves that problem.

I tried to it with PaperMC on aternos. But nothing changed :/

[roridev]

A workaround is having NoChatReports installed on the client or server.

cc @Ar7hurz1nh0