# Session Disconnected on Launch **URL:** \ **Category:** Issues and Bug Reporting\ **Tags:** launcher-error, fortnite-creative, unreal-editor-for-fortnite, session, fortnite\ **Created:** [February 18, 2026, 5:46am UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465 "2026-02-18T05:46:09Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![JotaBolota](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JotaBolota](https://forums.unrealengine.com/u/JotaBolota)\ **Post date:** [February 18, 2026, 5:46am UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/1 "2026-02-18T05:46:10Z")
### Summary Almost everytime I try to launch a UEFN Session it loads for some minutes and when the island loads on Fortnite it’s “session disconnected”, the few times that I manage to successfully connect to a Fortnite session I can only play it for one time, once I press “stop game” the session is disconnected again and I have to try to launch it all over again. I’ve been facing this issue for more than one week, and it’s completely random, sometimes it works just fine and sometimes (most of the times) it loads the island in a disconnected session, this is taking hours of my daily work progress ### Please select what you are reporting on: Unreal Editor for Fortnite ### What Type of Bug are you experiencing? Live Edit ### Steps to Reproduce Open UEFN, click “Launch Session”. If successfully load and connect to a Fortnite session then Start Game and End a Game ### Expected Result Loading the island properly on Fortnite and being able to playtest it multiple times without having to close and open Fortnite several times ### Observed Result When I click “Launch Session” it loads the island on Fortnite but when the loading ends most of the times the Session is Disconnected, the very few times the session is connected as it should, I can only play it for once, once I End the Game the session is disconnected again and I have to close Fortnite and try to Launch Session all over again ### Platform(s) windows ### Upload an image ![Captura de tela 2026-02-17 233408.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/e/4/b/e4bf7c2800bb197effffaaa5aa6e752d827f4b7e.png) ### Video [![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/2/b/12bfa9897277a895203ecd05f1066029f21b366e.jpeg "session disconnected") ](https://www.youtube.com/watch?v=7Hyv23U5he8) ### Additional Notes I didn’t add a island code because I didn’t publish this island yet. ---
**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\ **Post date:** [February 18, 2026, 1:05pm UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/2 "2026-02-18T13:05:28Z")
hi @JotaBolota This was a known problem before and was tracked down to not enough virtual memory UEFN needs about 64GB page file/virtual memory. [How to add virtual memory 64GB (64000)](https://forums.unrealengine.com/t/cant-create-c-project-or-use-c/238169) ---
**Author:** ![JotaBolota](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JotaBolota](https://forums.unrealengine.com/u/JotaBolota)\ **Post date:** [February 19, 2026, 1:50am UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/3 "2026-02-19T01:50:51Z")
I just tried it, step by step following this tutorial (tried twice, one time with 32000 and a second time with 64000) it did not work, I’m still having the same issue ---
**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\ **Post date:** [February 19, 2026, 12:39pm UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/4 "2026-02-19T12:39:18Z")
hi @JotaBolota Sorry to here that. When the new version of 39.50 has loaded try to verify your installation after 16:00 UTC [Verify installation and check your antivirus settings please](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/5) ---
**Author:** ![JotaBolota](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JotaBolota](https://forums.unrealengine.com/u/JotaBolota)\ **Post date:** [February 19, 2026, 10:17pm UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/5 "2026-02-19T22:17:46Z")
I’ve already tried verifying the files previously, and tried again right now after the update, still don’t work… At this moment it’s literally impossible to test it, I’ve tried several times to launch session since the update and a little bit before it and simply can’t do… Everytime that Fortnite loads the island immediately I see “Session disconnected” ---
**Author:** ![JotaBolota](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JotaBolota](https://forums.unrealengine.com/u/JotaBolota)\ **Post date:** [February 19, 2026, 10:55pm UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/6 "2026-02-19T22:55:41Z")
I really don’t know what none of this means, but maybe it can help finding a solution to this problem ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/0/a/70a002da25ba178c5510911f35c00b3f69f8eea7.jpeg) ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/5/0/8/50895a6621d5f11481a4d11092c430355d711b0b.png) ---
**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\ **Post date:** [February 19, 2026, 11:32pm UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/7 "2026-02-19T23:32:07Z")
hi its a network error ![image (5)](https://d3kjluh73b9h9o.cloudfront.net/original/4X/b/9/8/b98655eda0574475c1167714abd6654ceaa326b3.png) Do you have a antivirus product which includes networking products like zone alarm DO NOT use a VPN product as Epic often blocks these You will need to install UEFN with Administrator privileges to unblock all the gateway firewall setting on Windows 11 [UEFN will not install correctly from Launcher on any Windows 11 (eleven) version needs to run Elevated "Run As Administrator - General / Issues and Bug Reporting - Epic Developer Community Forums](https://forums.unrealengine.com/t/uefn-will-not-install-correctly-from-launcher-on-any-windows-11-eleven-version-needs-to-run-elevated-run-as-administrator/1787921) Then its just a matter of finding why the network disconnects ---
**Author:** ![JotaBolota](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JotaBolota](https://forums.unrealengine.com/u/JotaBolota)\ **Post date:** [February 20, 2026, 1:07am UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/8 "2026-02-20T01:07:11Z")
I uninstalled UEFN and installed it again and launched it for the first time running as admin following the tutorial, it still didn’t work… I hardly believe it’s something related to network, even though the output log says so, because it didn’t happened before… I’ve been working on this project for some months, and it started happening some weeks ago, until yesterday I still managed to successfully play test it on live edit in Fortnite (after several trials), but today I can’t, I’ve tried so many times and it never works… ---
**Author:** ![JotaBolota](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JotaBolota](https://forums.unrealengine.com/u/JotaBolota)\ **Post date:** [February 20, 2026, 1:22am UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/9 "2026-02-20T01:22:38Z")
I just tried opening a older smaller project in UEFN and it works just fine with this older project, but still never works properly on my current project, I don’t know if it’s a memory issue or something, but doesn’t look like a network problem since it only happens with this specific project… ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/8/8/388b83bf72dba24d84321f85e87a8a466ae80a87.png) ---
**Author:** ![JotaBolota](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JotaBolota](https://forums.unrealengine.com/u/JotaBolota)\ **Post date:** [February 20, 2026, 10:45am UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/10 "2026-02-20T10:45:30Z")
Update with good and bad news, good news: I’m finally able to launch session properly after I enabled all permissions to Fortnite and UEFN on Firewall. bad news: it still disconnects after I stop the game, so I have to launch it all over again after. edit: I also can’t launch a memory calculation as well, session disconnects when I try (Just did it right now) ---
**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\ **Post date:** [February 20, 2026, 10:56am UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/11 "2026-02-20T10:56:41Z")
Thats good news the problem many be similar to this problem that happened to me as well same problem with memory calculation. My way around this is to use an Android mobile phone (example old Samsung Galaxy 10) Load Fortnite onto phone, open lobby on phone select on UEFN on the dots Launch … select Connect Console Click Launch and the game starts on phone, Click red Stop Game then select Memory Calculation, which happens on phone and transfers to UEFN about about 3 minutes. This works on any console device Xbox One , Nintendo Switch 1 etc [Client Crash on “End Game” (v39.50) - General / Issues and Bug Reporting - Epic Developer Community Forums](https://forums.unrealengine.com/t/client-crash-on-end-game-v39-50/2700971) Well at least its sort of working 😁 most of the time ---
**Author:** ![JotaBolota](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JotaBolota](https://forums.unrealengine.com/u/JotaBolota)\ **Post date:** [February 23, 2026, 9:13am UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/12 "2026-02-23T09:13:17Z")
I was completely unable to launch session once more, so I noticed it all started happen after my memory usage surpassed the 100k limit, it was about 102k at that time, so I tried to just move some stuff around and when I reduced to about 100k I could launch session again, so I noticed that this was the main reason, then I optimized my project and reach about 95k memory, now I can launch session and run a memory calculation with no problem, the session still disconnects after I stop game, I didn’t fix my problem, but here’s the report of this new bug anyway, thanks for trying to help anyway ---
**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\ **Post date:** [August 17, 2026, 5:46am UTC](https://forums.unrealengine.com/t/session-disconnected-on-launch/2700465/13 "2026-08-17T05:46:11Z")
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