Players getting Network Connection Lost when joining public lobby

General Issues and Bug Reporting
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1

Summary

Some players are unable to queue to our map when matchmaking privacy is set to public. A few hours ago we were able to queue with no issues but now it doesn’t work. Private matchmaking and both edit and playtest sessions work with no issues

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Assets

Steps to Reproduce

  1. Put in the island code 1942-4233-3811
  2. Set matchmaking privacy to public
  3. Queue and wait for loading screen to appear
  4. Network Connection Lost screen appears

Expected Result

Successfully join public matchmaking, same as private one works

Observed Result

Network Connection Lost screen appears

Platform(s)

windows

Island Code

1942-4233-3811

Upload an image

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2

FORT-909570 has been created and its status is ‘Unconfirmed’. This is now in a queue to be reproduced and confirmed.

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3

I have the exact same problem with many different islands I’ve tried to play on. I have tried to connect both private and public with the same result.

The most current island I was on was: 6136-8270-1591

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4

@ndr Is this still happening?

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5

Hey im Andrejs partner and the issue is still occurring

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7

Yes, from our testing it still happens around 40% of time

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8

Could you let us know what country most of your clicks are coming from and what the percentage is?

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First is United States with just under 30%

10

We just got it in edit session too, seems like an issue with players joining in progress (sometimes). We did notice “Player joined the world” and “Player has left the world” messages in chat fire immediately one after the other and player gets Network Connection Lost screen without ever actually getting in

11

Could you get us your logs so we can try to figure this out here? We are unable to reproduce it.

12

I’m also having the same issue in my island: 4122-6885-3510

I’m attaching the logs below.

FortniteGame.log (9.2 MB)

13

Also getting this issue on my island: 0831-6059-6603

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@Flak still getting this after multiple updates. Really need help on this - it is hurting my game massively!
FortniteGame.log (5.0 MB)
FortniteLauncher.log (2.0 MB)
FortniteGame-backup-2025.06.16-08.35.41.log (6.4 MB)

1 Like
15

Thank you, @BrendannnD

16

We have the exact same issue, especially this join / leave message instantly happening.

@andrej / @Flak have you tested staying in the game for a while?
In our game it takes 15 minutes for the session to get glitched and unjoinable with 8 players in the game.
With 4 players, takes around 35 minutes. With 2, around 55 and 1 player 120 minutes.

We outlined clear steps to reproduce if it helps:

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17

FWIW we both seem to be having this issue - Validation error from outdated files in sys/versions (regression?) - #45 by ItsJacky. Could be totally unrelated but maybe connected.

1 Like
18

FYI I also experienced that issue.

1 Like
19

@BrendannnD any luck on your end?

We’ve been doing extensive tests for past 5 days but no luck yet, outlined them here: [CRITICAL] Tycoon Unjoinable “Network Connection Lost” After 15min – Matchmaking Still Sends Players - #7 by BrendannnD

Is this behavior similar to yours?

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No luck here - you have definitely done much more extensive testing than I have. As a workaround I tried disabling matchmaking after game start but it hurt my metrics too much. Really need Epic’s help on this one but I haven’t gotten any meaningful update besides the team has my logs.