Connection Errors

General Issues and Bug Reporting
, , ,
1

Summary

LogOnline: Warning: MCP: Tried to set EOS auth header in links but got empty token.
LogValkyrieOnline: Error: Syncing project failed due to: Unable to connect to urc-uefn.live.ucs.on.epicgames.com: gRPC connection … ConnectError(InvalidCertificate(UnknownIssuer))
SourceControl: Error: Could not authenticate with Unreal Revision Control servers because the login token could not be validated.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Unreal Revision Control

Steps to Reproduce

0 Clue

Expected Result

Login Succeeded

Observed Result

Not Working

Platform(s)

PC

Upload an image

1image.png
1image.png352×126 9.45 KB

3

LogVkScratchRepository: Error: [Auth] URC login failed in 0.22 seconds
LogVkScratchRepository: Error: [Auth] Unable to connect to urc-uefn.live.ucs.on.epicgames.com: gRPC connection to https://urc-uefn.live.ucs.on.epicgames.com/: transport error | Internal(Internal { context: “gRPC connection to https://urc-uefn.live.ucs.on.epicgames.com/”, source: tonic::transport::Error(Transport, ConnectError(Custom { kind: InvalidData, error: InvalidCertificate(UnknownIssuer) })), trace: Trace { locations: , overflow: false } })
LogVkScratchRepository: Error: [Auth] Unable to connect to urc-uefn.live.ucs.on.epicgames.com

also this error too when attempting to launch session for every project

4

Are you logged into the UEFN editor?

5

Yes, and launcher

6

Hi Jorq,
The team is still looking into this. Are you using a specific VPN or an Antivirus by chance? Please let me know.

7

No Anti-virus, no VPN, I’ve attempted logging out, reinstalling, resetting my router and nothing has worked

8

FORT-1117708 has been ‘Backlogged’. This is an issue that is in a queue to be addressed.

9

Is there any update on this?

10

Hi @Jorq1! Checking with the team.

Elena

11

Hey Elena, have you spoken to the team?

12

Epic has a two-week vacation as far as I know. One more week to go.

13

Okay thank you!

14

Hey @ElenaNizhnik hope you had a nice break! Could you please let me know as soon as possible if there’s an update to this

15

hi @Jorq1,

Thank you for your patience. The team began looking into this once they were back from the break. Please allow me to follow-up and get back to you.

Elena

16

Hi @Jorq1 - sorry to hear you’re still stuck on this. We’ve yet to be able to reproduce this state, but we’d like you to try the following using the CLI if you’re still experiencing it after yesterday’s release.

  • If you haven’t used the CLI before please follow the instructions to set it up here: Lore Version Control Command Line Interface in Unreal Editor for Fortnite | Fortnite Documentation | Epic Developer Community
  • Once you have the CLI set up, please close UEFN If you have it open
  • Find the project’s folder in your Fortnite Project’s folder in the Windows File Browser
  • Right click the project folder and Open in Terminal
  • Try the command lore auth clearto which you should hopefully see the response “Auth store cleared”.
    • There’s a chance you may need to use urc2 auth clear if lore auth clear doesnt work, but if lore auth clear works for you you can ignore this
  • Then, reopen UEFN and the project in question, and hopefully you should be able to connect with a fully refreshed token.

Look forward to hearing whether this works for you.

17

Hey, this error occurs for all of my projects, but still attempted anyway.

Unable to connect to urc-uefn.live.ucs.on.epicgames.com
Unable to connect to urc-uefn.live.ucs.on.epicgames.com: gRPC connection to https://urc-uefn.live.ucs.on.epicgames.com/: transport error | Internal(Internal { context: “gRPC connection to https://urc-uefn.live.ucs.on.epicgames.com/”, source: tonic::transport::Error(Transport, ConnectError(Custom { kind: InvalidData, error: InvalidCertificate(UnknownIssuer) })), trace: Trace { locations: , overflow: false } })
Connection Error: Could not authenticate with Lore servers because the login token could not be validated.
Revision control is disabled

I don’t know if this impacts the issues, but when I tried to launch UEFN after doing this, it was stuck on 90% until I restarted UEFN.

image

18

Do you have any network sniffer installed like Fiddler?

19

No

20

Could you create a file called script.ps1and paste the following contents:

$h='urc-uefn.live.ucs.on.epicgames.com'; $p=443
$c=New-Object Net.Sockets.TcpClient($h,$p)
$s=New-Object Net.Security.SslStream($c.GetStream(),$false,{$true})
$s.AuthenticateAsClient($h)
$x=New-Object Security.Cryptography.X509Certificates.X509Certificate2($s.RemoteCertificate)
$ch=New-Object Security.Cryptography.X509Certificates.X509Chain
$null=$ch.Build($x)
$ch.ChainElements|%{"s:"+$_.Certificate.Subject;"i:"+$_.Certificate.Issuer;""}
"Verify: "+$(if($ch.ChainStatus.Count -eq 0){"0 (ok)"}else{($ch.ChainStatus|%{$_.Status}) -join ', '})
$s.Dispose();$c.Close()

Then execute it from a command prompt using powershell -executionpolicy bypass -File script.ps1

And share the output with us?

21

The new update seemed to fix the issue, but thank you for all your quick responses you’ve given