KartKraft Failed to Authenticate

[pikadragon377]

Is this problem fixed yet for other people? I haven't played KartKraft since September and now when I start the game it says the authentication failed and I cannot play. I have re installed the game. Steam doesn't want to give me a refund because I have 3.5 hours. I can't play a broken game and I can't get a refund.

[LXS77]

Yes, the connection to the backend platform was fully restored on the 5th of Feb (thanks to good people of Studio 397) and the game is playable again (TT, Practice and races against the AI are available, Online mode is down and unlikely to come back).

To get more details on the error, you can check project_k.log file in %localappdata%/project_k/Saved/Logs or maybe try to reinstall the game completely using the tips below:

Uninstall the game in Steam, then check and, if still present, manually delete the folders:
• %localappdata%/Unreal Engine
• %localappdata%/project_k
• ../SteamApps/common/KartKraft
Restart your PC, go to Steam and install the game again.

[kuzV]

I tried all of the above, including updating windows
but still getting same error

how can I fix this?

[LXS77]

Originally posted by kuzV:

still getting same error

Have you checked the log file? What does project_k.log say?

[kuzV]

Originally posted by LXS77:

Originally posted by kuzV:

still getting same error

Have you checked the log file? What does project_k.log say?

It says
SSL certificate problem: unable to get local issuer certificate

[kuzV]

[2025.02.14-21.00.24:304][158]LogCloudDocumentTasks: CloudDocumentManager: Authenticating...
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: invalid HTTP response code received. URL: https://kartkraft.herokuapp.com/auth/bd, HTTP code: 0, content length: 0, actual payload size: 0
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: request failed, libcurl error: 60 (Peer certificate cannot be authenticated with given CA certificates)
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 0 (Hostname kartkraft.herokuapp.com was found in DNS cache)
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 1 (  Trying 23.22.130.173...)
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 2 (TCP_NODELAY set)
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 3 (Connected to kartkraft.herokuapp.com (23.22.130.173) port 443 (#9))
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 4 (ALPN, offering http/1.1)
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 5 (Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH)
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 6 (TLSv1.3 (OUT), TLS handshake, Client hello (1):)
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 7 (TLSv1.3 (IN), TLS handshake, Server hello (2):)
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 8 (TLSv1.2 (IN), TLS handshake, Certificate (11):)
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 9 (TLSv1.2 (OUT), TLS alert, Server hello (2):)
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 10 (SSL certificate problem: unable to get local issuer certificate)
[2025.02.14-21.00.24:413][171]LogHttp: Warning: 0000017559C67720: libcurl info message cache 11 (Closing connection 9)
[2025.02.14-21.00.24:413][171]LogCloudDocumentTasks: CloudDocumentManager: Authentication failed. Retrying...

[LXS77]

Originally posted by kuzV:

SSL certificate problem: unable to get local issuer certificate

And what Windows version do you use? Versions prior to 22H2 are known to have connectivity issues due to outdated certificates.

[kuzV]

Originally posted by LXS77:

Originally posted by kuzV:

SSL certificate problem: unable to get local issuer certificate

And what Windows version do you use? Versions prior to 22H2 are known to have connectivity issues due to outdated certificates.

It's 10
I'm not sure which one though

[pikadragon377]

I am having the same problem too. I followed the steps but I have the same "Failed to authenticate" when launching the game.

[pikadragon377]

Also I am on Windows 22H2.

[kuzV]

Originally posted by LXS77:

Originally posted by kuzV:

SSL certificate problem: unable to get local issuer certificate

And what Windows version do you use? Versions prior to 22H2 are known to have connectivity issues due to outdated certificates.

22H2 completely updated

[LXS77]

Originally posted by kuzV:

22H2 completely updated

OK, try to install Starfield Services Root Certificate Authority - G2 (SFSRootCAG2.cer). You can download it from https://www.amazontrust.com/repository/ , RootCAs table, last row of the table (CN=Starfield Services Root Certificate Authority - G2) , click DER to get the certificate.

[LXS77]

Originally posted by pikadragon377:

I am having the same problem too. I followed the steps but I have the same "Failed to authenticate" when launching the game.

The thing is "Failed to authenticate" error can be caused by a number of things. What does your project_k.log say? It it states libcurl error: 60 (Peer certificate cannot be authenticated with given CA certificates), please try a solution above (install a compatible root certificate).

[pikadragon377]

Originally posted by LXS77:

Originally posted by pikadragon377:

I am having the same problem too. I followed the steps but I have the same "Failed to authenticate" when launching the game.

The thing is "Failed to authenticate" error can be caused by a number of things. What does your project_k.log say? It it states libcurl error: 60 (Peer certificate cannot be authenticated with given CA certificates), please try a solution above (install a compatible root certificate).

OMG UR THE GOAT tysm!!!! You saved me! Thanks for wanting to help out :D

[LXS77]

Originally posted by pikadragon377:

OMG UR THE GOAT tysm!!!! You saved me! Thanks for wanting to help out :D

You're most welcome!

Don't forget to apply this Steam launch option: -EnableGRPC=false
It's a workaround for fps drop/stuttering.

[kuzV]

Originally posted by LXS77:

Originally posted by kuzV:

22H2 completely updated

OK, try to install Starfield Services Root Certificate Authority - G2 (SFSRootCAG2.cer). You can download it from https://www.amazontrust.com/repository/ , RootCAs table, last row of the table (CN=Starfield Services Root Certificate Authority - G2) , click DER to get the certificate.

Worked! thank you so much!