Fortnite crashes when launching UEFN session

General Issues and Bug Reporting
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1

Summary

I wanted to push an update to an existing project that I have been working on, but it looks like my project has somehow completely broken.

I went over the logs of UEFN, Epic Games Launcher and Fortnite, yet they do not give me a clear direction as to what is happening. From what I was able to discover from logs however, is that UEFN attempts to launch a Fortnite session and appears to be failing to do so. Common fixes have been tried, but at this point I dont know what else to try.

I was able to investigate and find possible culprits through logs:

  1. ‘EpicGamesLauncher.log’ - ERROR - “[414]LogRunningAppService: Display: Dead foreground process [25796] F:/Program Files/Epic Games/Fortnite/FortniteGame/Binaries/Win64/urc.exe for app F:\Program Files\Epic Games/Fortnite”.

Additionally another error is displayed - ERROR - “LogAutoUpdateService: CheckForUpdates: At least one application or editor doesn’t allow auto-updates: AppId: fn:4fe75bbc5a674f4f9b356b5c90567da5:Fortnite”,
“[ 93]LogEOSMessageService: Error: Unable to find port.”
2. ‘FortniteLauncher.log’ - WARNING - "WARN msg=“error running fortnite” err=“exit status 3” gets displayed after attempting to run ‘FortniteClient-Win64-Shipping_EAC_EOS.exe’ " . This file is tried to be executed multiple times before it finally crashes due to ‘heartbeat’ being timed out I assume (ERROR - “LogCore: Warning: Failed to reach checkpoint within alotted time of 600.00. Triggering hang detector.” through log in ‘FortniteGame.log’.

On my secondary computer it also fails but with exit status “0xeeac1018”.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Matchmaking

Steps to Reproduce

Open UEFN and launch a session. It gets stuck in “Connecting…” screen and crashes there in about 10 minutes.

Expected Result

Fortnite session is launched successfully to validate functionality and calculate memory.

Observed Result

Fortnite crashes with unexpected error message. UEFN stays open.

Platform(s)

PC

Island Code

9510-3204-1034

Additional Notes

Although I did re-install my project to a separate drive, I have performed multiple reinstalls to both drives and that does not appear to be related, as I also tested on my secondary computer and encounter the same Fortnite crash there when launching a session.
As an additional note, my other projects (a lot smaller) appear to launch just fine. And this was launching fine the last time I was working on it (23.03.25).
I have tried to validate my project, deleted the project under “../Fortnite Projects” to get a fresh version, use previous versions through URC, built landscapes, use a different computer, built HLODs but nothing seems to work.

2

Did some additional digging into ‘FortniteGame.log’ logs, and found out that upper part of logs is full of the following error message:

LogDownloadOnDemandGameplay: Verbose: [3d2c] Failed To create Download On Demand Project. Link entry was deemed invalid

So my hypothesis is that for some reason my connection to this project is either marked as ‘invalid’ (authentication maybe?) or the link to my project does not exist in Epics side..? And it keeps trying to connect to it (there’s thousands of this message in logs) until it finally reaches timeout and causes Fortnite to terminate my requests by ‘crashing’.

I’ve never had such an issue before and I would really appreciate some help - I can provide any logs necessary to get this resolved ASAP :slight_smile:

3

Can confirm that we’re also experiencing this on a large map. Smaller maps seem to launch sessions without this issue.

1 Like
4

Since I’m not the only one impacted by this, can we get some confirmation that this is being investigated? Most likely this is caused by the latest 34.20 patch.