36.10 Matchmaking fails every time error #1 constant on Island 3815-8254-6961

[Jimbohalo10]

Summary

Matchmaking on island 3815-8254-6961 failure EVERY TIME at 79 seconds

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Matchmaking

Steps to Reproduce

open 3815-8254-6961 from the lobby
fails “finding Server at 01:19” EVERY TIME on any Platform
used to fail 1 in 10 35.00 then 5/10 35.20
Fails every time on 36.10

Expected Result

Play island

Observed Result

fails “finding Server at 01:19” EVERY TIME on any Platform

Platform(s)

Windows 11 PC, Samsung Galaxy Android, Nintendo Switch 1, Xbox One X

Island Code

3815-8254-6961

Additional Notes

The logs are attached in the next post. The complete log
The other log is just the part of the log when the second matchmaking failure occurs.

[Jimbohalo10]

hi
here is the fornitegame.log 36.10
FortniteGame.log (3.4 MB)

Here is the matchmaking part when the failure occurs
FortniteGameMatchErr-Island-36_10Island-3815-8254-6961.log (138.8 KB)

There ia another post describing settings on a similar problem with Matchmaking
Erreur de Matchmaking #1 - General / Issues and Bug Reporting - Epic Developer Community Forums

[Bug-Reporter]

FORT-926143 has been created and its status is ‘Unconfirmed’. This is now in a queue to be reproduced and confirmed.

[Jimbohalo10]

hi @Flak. and all devs/engineers @Astrotronic
UPDATE 19 June 11:38 GMT 06:38 EST

Just switched the privacy on the lobby screen from public to private, and now matchmaking success is achieved in under 11 seconds.

Then switch back Privacy FROM PRIVATE to PUBLIC and fails again after 92 seconds

This is MASSIVE for me

[Flak]

Getting this in front of the team.

[thrax207]

@Flak this post also has very clear steps to reproduce for this issue, can you bring it in front of the team as well please?

[CRITICAL] Tycoon Unjoinable “Network Connection Lost” After 15min – Matchmaking Still Sends Players

Nintendo Switch 1 is the fastest at 93 seconds for everything 12 seconds to Match server. Second time round really quick There are no ping/FPS stats on a Nintendo Switch 1 This may be my settings but no music no voice on Android. If you want this on console somehow you have to get a visible message to say that the voice is off, seen that sort of thing on another island, possibly in Verse. Thanks for giving me a run down on whats happening. When the failure occurs Find PC delete all the l…

[Jimbohalo10]

hi All.
So now taken the PUBLIC and PRIVATE and github diff them and found this section

LinkId [Mnemonic=[3815-8254-6961] Version=[latest]]
                WorldId [World [None] WorldName [None] WorldOwnerId [INVALID] IsJoinable [Unjoinable]]
                ProductModes [None]
-               SessionId [Session Id [None] Join Info [IslandJoinability [CanNotBeJoinedOrWatched] SessionKey [None]]]


The correct result should be

+               SessionId [Session Id [4b45a0cae0aa46969dd1e52efa8e3ea0] Join Info [IslandJoinability [Joinable] SessionKey [DC8D1FE533174B66BD1D3B6CF12D71D1]]]


-               Privacy [Fill]
+               SessionId [Session Id [4b45a0cae0aa46969dd1e52efa8e3ea0] Join Info [IslandJoinability [Joinable] SessionKey [DC8D1FE533174B66BD1D3B6CF12D71D1]]]

Succesful

+               Privacy [Private]
+               Region [EU]
+               MatchmakingId [4733DECD4AEB13B75EE437BF69C7201E]]

privacy FILL is PUBLIC
THE UNKNOWN ERROR in the Matchmaking error box is

Join Info [IslandJoinability [CanNotBeJoinedOrWatched]

privacy PRIVATE is PRIVATE

•           SessionId [Session Id [4b45a0cae0aa46969dd1e52efa8e3ea0] Join Info [IslandJoinability [Joinable] SessionKey [DC8D1FE533174B66BD1D3B6CF12D71D1]]]
  

result good
MatchmakingId [4733DECD4AEB13B75EE437BF69C7201E]

There may be more information which which may be found

[thrax207]

@Jimbohalo10 We’ve done a 3/4 day debug session and posted the results here: [CRITICAL] Tycoon Unjoinable “Network Connection Lost” After 15min – Matchmaking Still Sends Players - #8 by thrax207

Do you see any logic? I can’t make to seem any sense off it.
It appears the more of my verse code I disable, the later the bug appears, but it will eventually appear?

We’re going to now debug this map code you shared here with 5 accounts, we’ll let you know any outcomes.

[thrax207]

@Jimbohalo10 I tested on this game and I get the weirdest results.

1. We tried public, 3 players, matchmaking took 70 seconds and we received the same Matchmaking error #1 as you shared.
2. We tried private, 3 players, we got in a game. We tested a win, and waited for the new ‘game/round’ to start, I saw a Matchmaking error #1 and now the game is stuck on Game Ending in 0 forever.
3. When I press Cancel and Ready Up again (whilst I’m still in the game, on this Game end result screen) I keep running into Matchmaking Error #1.

When we leave that game and join a new one, I can reproduce the steps exactly the same on #2 and #3.

[Jimbohalo10]

@thrax207

We tried private, 3 players, we got in a game. We tested a win, and waited for the new ‘game/round’ to start, I saw a Matchmaking error #1 and now the game is stuck on Game Ending in 0 forever.

If you look in Log FortniteGame.log and earlier
Notepad Control +F Find the “[CanNotBeJoinedOrWatched]” and there will be loads!
This was found like my post shows using github diff in the working Private version and the matchmaking error 1
Why do we need to use complex linux*nix tools from C++ development to find this?
My thinking is if you check the logs Round 1 will have reset some parameter in the teams data strucure and

“Privacy: Private” back to “Privacy: fill”, which is PUBLIC.
Thats what has happened in my attempts, the second attemp can fail and change to PUBLIC, the back to PRIVATE and this successfuly matchmake again..

If as the line in Log file LOGMATCH: CALLING MATCHMAKING LEGACY CODE before the failure in private version, why is it not called in PUBLIC version.
There are two different code bases, because when first time selecting private could see Download Island message, so they are different, what is the UNKNOWN error,just cannot find in the log!

IMHO at the current state this is much harder to debug than building my updates into Unreal Engine 5.6 standard.

[Jimbohalo10]

hi @thrax207 ,
So had time to look at your Matchmaking log using the search/ find “Privacy:” and a failure

Firstly want to apologise if this is too technical too deep for you

The main error below is JIP. What’s JIP (Join In Progress) ?

These seem like possible lines causing the problem

thraxLog.txt:[2025.06.16-13.37.08:859][597]MatchmakingLog: [3685] Not matchmaking : local users not ready for JIP

This list of relevant lines might help other Epic Enginners

2025.06.16-13.37.08:497][554]MatchmakingLog: [3520] thrax207 added play history for Mnemonic=[9524-0220-6933] Version=[latest]:

[2025.06.16-13.37.08:858][597]LogActivityBrowser: Warning: [3aac] PlayWithFriends feature is enabled but no PlayWithFriends panel found.

What does that warning mean?

[2025.06.16-13.37.08:858][597]LogFort: DynamicBackgroundDirector(Lobby): HandleTextureLoaded
[2025.06.16-13.37.08:858][597]LogTeamPedestal: Verbose: [3dcd] Num of Pedestals to initialize: 5
[2025.06.16-13.37.08:859][597]LogJamInLobbyPlayspace: Island Product.FNE has jamming enabled
[2025.06.16-13.37.08:859][597]LogMatchmakingUtility: [2d77] LinkId: 'Mnemonic=[9524-0220-6933] Version=[latest]'

[2025.06.16-13.37.08:859][597]LogMatchmakingUtility: [3215] Privacy: Fill
[2025.06.16-13.37.08:859][597]MatchmakingLog: [3685] Not matchmaking : local users not ready for JIP

[2025.06.16-13.37.08:864][598]LogFortDiscoverItemListView: [3d77] : Setting a reference panel label on a label that already contains 'Popular'
`

[2025.06.16-13.37.08:864][598]LogFortDiscoverItemListView: [3d77] : Setting a reference panel label on a label that already contains 'Updated'
2025.06.16-13.37.08:864][598]LogFortDiscoverItemListView: [3d6f] : Setting a panel tag style on a tag style that already contains 'social'
[2025.06.16-13.37.08:864][598]LogFortUI: Warning: [3c15] Future Time was not Setup! Unable to start timer.
[2025.06.16-13.37.08:864][598]LogFortDiscoverItemListView: [3d77] : Setting a reference panel label on a label that already contains 'New'

Matchmaking Flow Summary: 

PVP TYCOON - 17s 429ms
Flow finished successfully

Parameters:
	Island: 
	MatchmakingGroup:
		thrax207 (Local) - Ready
		VastHorizonsFN - Not Ready
	Metadata:
		LinkId [Mnemonic=[9524-0220-6933] Version=[latest]] 
		WorldId [World [None] WorldName [None] WorldOwnerId [INVALID] IsJoinable [Unjoinable]] 
		ProductModes [None] 
		SessionId [Session Id [469433b576fb4466bb463eba93435cc5] Join Info [IslandJoinability [Joinable] SessionKey [B7641A61B8B6423AAD8C4FC934BC4A98]]] 
		Privacy [Fill] 
		Region [EU] 
		MatchmakingId [D09A31DA4B26D4BB943C3E8E951DAA3F]
	UnrankedSet [Invalid],
	UnrankedIslands [Mnemonic=[9524-0220-6933] Version=[6]],
	UnrankedFallback [**Invalid**],
	RankedSet [**Invalid**],
	RankedIslands [Empty],
	RankedFallback [**Invalid**],
	bGracefullyUpgraded [False],
	PlaylistName [NoPlaylist]
	
	Party Leader: VastHorizonsFN

Steps:
	Matchmaking Begin - Immediate - Success:
	Hidden Delay - Immediate - Success:
		No member uses the 'Matchmaking Delay' setting, continuing...
	Refresh DAD - Immediate - Success:
		UGC mode, no playlist update required
	Refresh MCP Profiles - 743ms - Success:
	Validity Checks - Immediate - Success:
	Preload Athena - Immediate - Success:
		No need to preload athena for this mode, discarding prior athena references
	QosUpdate - 1s 73ms - Success:
	Anticheat - 679ms - Success:
	Keychain Update - Immediate - Success:
	Install Game Features - Immediate - Success:
	Clear Caches - Immediate - Success:
	Clean Up Old Sessions - Immediate - Success:
		No Session Found When Cleaning Up Old Sessions
	Clean Up Old Console Sessions - Immediate - Success:
		Not on Console So No Need To Clean Up Old Conslole Sessions
	Request Reservation - 3s 773ms - Success:
		Joining existing session. SessionId [SessionId: 469433b576fb4466bb463eba93435cc5]
		Attempting to join VastHorizonsFN
		Joined VastHorizonsFN
	Request Moderator Permissions - Immediate - Success:
	Wait For World Session - Immediate - Success:
		No world set
	Find World Session - Immediate - Success:
		No world set
	Request World Token - Immediate - Success:
		No world token required
	Call Matchmaking Service - Immediate - Success:
		Joinable session so no need to request a session.
	Find Session - 299ms - Success:
		Succesfully Found Session [Id: 469433b576fb4466bb463eba93435cc5]. Local user number: 0. Ping: 9999ms
	Query Session Encryption Key - 233ms - Success:
		Querying encryption key for thrax207 (Primary player) with Id: MCP:1c72ad98d5894588974ce45b42e3f1b9
	Query User Session ID Tokens - 234ms - Success:
	Reserve Position Within Existing Session - Immediate - Success:
		Already reserved for full party before finding session
	Refresh Auth Tokens - Immediate - Success:
	Join Session - 265ms - Success:
		Player With Id [1c72ad98d5894588974ce45b42e3f1b9] Joined Session [GameSession]
	Download Content - 3s 827ms - Success:
		Starting Download
		Content Beacon Readiness Changed To: Server is generating manfiests for consumption by the client.
		Content Beacon Readiness Changed To: Server is generating manfiests for consumption by the client.
		Content Beacon Readiness Changed To: In the progress of mounting the content.
		Content Beacon Readiness Changed To: Client is up to date with server content.
		Content Beacon Disconnect Requested
		Content Beacon Readiness Changed To: Client is up to date with server content.
		Content Beacon Readiness Changed To: In the progress of disconnecting from the host.
	Wait For Server Initialization - 2s 265ms - Success:
	Wait For Non Local Party Members Before Travel - Immediate - Success:
		Island has joinable session. Not waiting for non local party members before travel
	Wait For Travel Animation To Complete - 4s 2ms - Success:
		Travel animation started
		Travel animation finished
	Loading Screen - 35ms - Success:
	Travel To Session - 1ms - Success:
		Starting travel for controller 0 to session GameSession
[2025.06.16-13.37.07:833][482]LogQos: [UQosRegionManager::RegisterQoSSettingsChangedDelegate] delegate was replaced
[2025.06.16-13.37.07:833][482]LogFortPlaytimeManager: [3e62] Unblocking idle states from source Matchmaking

Put two stars against invalid

thraxLog.txt:[2025.06.16-13.37.07:838][482]MatchmakingLog: [3685] Not matchmaking : local users not ready for JIP
thraxLog.txt:[2025.06.16-13.37.07:838][482]MatchmakingLog: [34da] Starting Session [
thraxLog.txt:[2025.06.16-13.37.07:838][482]MatchmakingLog: [3c80] thrax207 is now Eligible for matchmaking
thraxLog.txt:[2025.06.16-13.37.08:497][554]MatchmakingLog: [3520] thrax207 added play history for Mnemonic=[9524-0220-6933] Version=[latest]:
thraxLog.txt:[2025.06.16-13.37.08:854][597]MatchmakingLog: [37f6] Updating local island from party change
thraxLog.txt:[2025.06.16-13.37.08:859][597]MatchmakingLog: [3685] Not matchmaking : local users not ready for JIP
thraxLog.txt:[2025.06.16-13.37.15:032][169]MatchmakingLog: [35e6] UpdatedIsland [
thraxLog.txt:[2025.06.16-13.37.25:644][173]MatchmakingLog: [3c80] thrax207 is now Eligible for matchmaking
thraxLog.txt:[2025.06.16-13.37.25:644][173]MatchmakingLog: [3187] Island Refresh Started

These seem like possible lines causing the problem

thraxLog.txt:[2025.06.16-13.37.08:859][597]MatchmakingLog: [3685] Not matchmaking : local users not ready for JIP

[Jimbohalo10]

Hi all,
The new update, at 13:00 GMT and 08:20 ET, does not do much.

The Privacy box has how DISAPPEARED, just play the box and it still fails at 2:10 , 250 seconds.

There was a download, who knows, no game found flashing picture

UPDATE:

The error appears in the log as Matchmaking: JIP Queue → Full.
Why there is nobody in the game?