Hosting and Joining Multiplayer Games | Multiplayer Tutorial Series | Unreal Engine 5

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In this video we take a look at how we can Host and Join multiplayer games using the Session nodes from the Default Online Subsystem integrated in Unreal Engine.
We also go over what an Online Subsystem is, and which different Online Subsystems are available for us.
Everything covered in the video is done in Unreal Engine 5, and by using blueprints.
Video timestamps:
00:00 - Intro to video
00:25 - Overview of result
00:56 - Explanation of Sessions / OnlineSubsystems
07:43 - Taking a look at the Unreal Engine Session nodes
08:47 - How to Host a Game (Create Session node)
11:10 - Finding and Joining a game (Find Session, Join Session nodes)
16:47 - Leaving a game (Destroy session node)
18:07 - Outro
🌐Links used in the video:
Online subsystem documentation:
docs.unrealengine.com/4.27/en...
Steam Advanced Sessions Plugin:
forums.unrealengine.com/t/adv...
Playfab Game Backend service:
playfab.com/
#UnrealEngine #Multiplayer #Sessions
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[@Kekdot]

Hey guys, 👨‍🏫 My Patreon link: www.patreon.com/kekdot Download Project Files | Premium Tutorials | Courses 💦 Get our Game on Steam | Kekdot Center: store.steampowered.com/app/1487180/Kekdot_Center/

[@dakotayocom7764]

I spent twelve hours perfecting this code trying to figure out why my controllers aren't possessing pawns. That's three days for a hobbyist like myself. Well, the answer was that I forgot to change the input mode back to game after you click the host lobby button. I was so excited when I figured that out ; I then spent three more hours trying to figure out I have to do the same thing on the join lobby button. This is why I keep my day job!

[@thana3270]

that literally happened to me

[@tomaslaaperi5849]

@@thana3270 me too, not quite sure how to make character move after clicking "play" in my main menu level :(

[@Rgamesdev]

Create C++ project or you cant handle this subsystem. Its buggy. If you want use blueprint you can use. But you need to create C++ project or clients cant connect your server.

[@Rgamesdev]

@@tomaslaaperi5849 you too.

[@nestalaudat3164]

Yeah I'm having the same issue, so what you have to create a c++ class?

[@pinklloyd]

Amazing tutorial. This has got to be on of the finest tutorials I've seen yet. You sir are meant to be an Unreal Instructor and make millions. Can't wait to see your next.

[@ph11n1x]

If only tutorials would be this good on the average! Excellent work my man.

[@herogamesstudio]

You are amazing, perfect explanation and so simple!

[@speedwaylabsdev]

You are legendary. Please keep going. I will support you

[@kippe1221]

Thanks for this btw. There are very few videos on that topic, people are desperate for answers, thanks!

[@michaelsparkson]

Love it. Please continue this series.

[@Kekdot]

will do

[@KutsalKurt]

Thank you so much for your help! I will save this video snd watch it again when i need it!

[@SupernovaOneFourOne]

Super easy to understand thank you so much

[@wakey4286]

WOW! This is awesome, thanks!

[@JakobESG]

This Video is so good, keep it up

[@dwiyantorissetyono7345]

Great Explanantion and complete. thank you very much

[@mahamasamataman3087]

Thank you for this info-packed tutorial. I can see that it has a lot (I mean a LOT) of info; but I am not yet familiar enough to be able to grasp most of what you are doing. For me, I need to start from "You jus downloaded the Unreal engine...." rather than "... and then download this compete project ...." I feel the need to know the steps in between.. how to make that template project ... and it parts... why each of them is there... Yes, artwork will have to be acquired (I would love to see videos on how to do that too); but I am hopeful to see how to do all of this from scratch.... You don't have to do it, it could be pointers to other people's work if there exists videos that explain it all already.... Thank you for your time....

[@josesierra4577]

Omg thank you. Easy tutorial to follow.

[@slibbynl9425]

Ty so much i always wanted to create multiplayer! thx!!!

[@Tranehed]

Thank you! Very well explained! :)

[@safak2492]

Dope video, subbed 👍

[@FraPzsz]

You didn't show us the WB_SessionDemo. I don't understand how you made all the widget appear on the main menu since you didn't use the one we created.

[@danieldelorme2482]

Awesome Tutorial! Thanks, very clear and well done!

[@GilbertoDesign]

Man! you are awesome!

[@samuelbowers3289]

Can you help me create the sessionDemo widget as you missed it out in the video please? Without it nothing works!

[@StevenDiLeo]

You explained it awesomely, thank you for this!

[@InstantMash]

Oh man. I've just wrapped up my 23rd hour of learning game dev with UE5, having no prior experience with anything. about 20 of those hours were spent on this alone. Managed to get everything working though! I struggled with two things: The first was trying to figure out what those two "[ • ]" variable blocks in the server graph were for. I'm sure you went over it at some point, but I ended up finding out through the variables section of the docs that they're text-to-string & string-to-int. The second was the "For Each Loop" in WB_FindSession. It just straight up didn't exist. Through some digging I found a workaround was to create a new blueprint and copy it over.

[@InstantMash]

@@sunfix991 I absolutely did not find it stressful, I found it informative. If you need to rag on other people to make you feel better about your own short comings and insecurities then knock yourself out.

[@user-nf4pt4vk5x]

@@sunfix991 big lose dog. arbitrarily putting someone down. take that stuff somewhere else

[@nickhuff90]

what was the work around?

[@Kekdot]

The for each loop macro is available in any blueprint. Idk what he means by ‘just straight up didn’t exist’ and his ‘workaround’. Simply right click anywhere in the/any blueprint graph and type im ‘for each loop’.

[@Kekdot]

You can also simply hold F on your keyboard and left click somewhere to get a for each loop in the graph.

[@orangeaedan]

Great video! It’s a really good tutorial and really helped me out. Just 1 question is, how can i make skins work. When someone joins it’s just the default skin.

[@rifat.ahammed]

Thank You very Much.

[@cheemayt1530]

Was looking for something like this for weeks now, Amazing Tutorial & Thanks man!

[@Luca-yq5ux]

kekdot the goat for best practise mp

[@kippe1221]

A bit confused. If you would have that Game there packaged and on 2 seperate PCs in 2 seperate countries, would that work? Could they connect? It just feels like there is something missing. If i wanted to make a Game where everyone could Host a session, would that work? I have set up such a system and a game before, never tried if it actually works because i thought it cant be that easy.

[@flacastrexy]

if you are unable to connect to the session, add a parameter "listen" to the function "Open Level"

[@emilyplaysgamesstuwe5801]

Nice tutorial, I need this for my game “Mans best friend” Btw, how do you get a certain amount of people on multiplayer?

[@wiktoriapoch2679]

If anyone has problems with opening the map while hosting or joining the session, try to open level by reference, instead of open level by name

[@stormolflak]

Thanks a lot man

[@ztekstudio]

Yoho! Wonderful tutorial, but I still have one question about this: If a player crashes or leaves with Alt+F4 how would I disconnect them properly? For example if the server loses the connection, clients can't search for sessions again because their session wasn't destroyed or was it?

[@tr1n1ty77]

Thank you!

[@user-cb5ou8eh4i]

Is there a video from you or any other youtube channel that shows how the Sessions Demo is created? i am pritty new to UE5 and cant seem to get this working. The Demo blueprint i think combines all the created blueprints. But how do i create that one? The rest of the video was verry clear and relatable!!

[@sandjarsharshekeev4383]

Thank you very much for your tutorials! Now I understand the logic behind everything, but as a complete noob I don't know how to properly copy the widgets. Can anybody please explain me at least roughly or recommend a video or an article to read? My main problem is how to make a border to a certain size, not the whole window. Thank you very much!

[@K3rhos]

I'm still learning about multiplayer on Unreal Engine, but question here, is it possible to instead make the client not worrying about the sessions system, like no sesions list, let me explain: When a player launch the game, he simply click on "Play 'Name Of My Game'", and the game try to find an already hosted session on the network, if one is found (and not full) you put the client into the game but if no sessions has been found, its automatically hosting a new session ! Also it could be cool if the session could "swap host", if the player that created the session leave but another player is still in the session, this other player become the new host of this session ! Pretty sure all of that is possible, but I don't know if the built-in sessions system of UE is capable of doing that. Thx for the video, it was very useful.

[@jonda_mc]

do I have to open a port in the firewall? because I tried to connect with my friends via Hamachi and it didn't work even when I tried via lan network. so i have to open that port?

[@BluMango567]

I have a Question, what are the dots from the text changed public connections?

[@igorcosta6097]

Muito bom!

[@DimitryArsenev]

Somehow I don’t understand UE well (I develop on a unity). Uni has room/channel logic (Photon, Tnet, etc). An example - in DotA, 10 people in a room play on one map, and there are many such rooms on the server, the data, respectively, is not synchronized with everyone, only between those who are in the room. What is the UE room alternative? And as I understand it, it is important for me to use several of these rooms at the same time (an example is a chat, an example is a list of games showing data from other rooms)

[@dylanbello-gamedev5923]

Hello! Firstly great tutorial, has been very helpful in understanding the ins and outs. Ive been following along and I notice you are using 1 widget called SessionsDemo. Im curious is this widget is just 1 with all of these separate widgets inside of it. Or is it referencing these other widgets? just a little confused with how the UI is presented like that. Thankyou for any assistance!

[@Kekdot]

Glad you like it! It’s the widget with all of the other widgets inside of it.

[@redwolf831]

How exactly did you add all of them together?

[@Trojangomer]

@@redwolf831 make a Canvas Panel and then put the widgets on there.

[@KillerSneak]

How would you take your lobby as a ”fireteam/squad” from your own lobby (with its own session) to a dedicated server (new session) its the one thing I can’t wrap my head around. How do you get your squad from the lobby to the server as a whole (all 4 need to connect to the dedicated server and need to be/stay your fireteam/squad as well)

[@primordial987]

TY)

[@TheSlimHim]

But how did you get the main menu to be displayed on both instances of the game? Same for getting the same camera for both?

[@ttv_mrjack6749]

Can I expose the "Get Server Name" from Result, before creating a server. So I can change the displayed System ID, as a way to create a "Server name" customization? Right now its hardlocked to display Steam name, or System ID.

[@savnitprasad9049]

What plugin did you use to create your level. I mean that low poly blocks in your level

[@randallmiller3162]

Great video. When I build a main menu, I have a start game widget and a find game widget. When I launch the lobby, if my client is in another screen, it always sends him the main menu widget. This is in UE5, never had this happen in UE4

[@Rgamesdev]

I know this problem. I solved this problem after 3 months xd . You need to create C++ project not blueprint. But you can still use blueprint. If you create bp project you cant host the game . Game kicking you main menu.

[@CringingDragon]

I Have everything working save for joining the actual game. Both players can load up the game, start it with steam overlay, all plugins and subsystems set, even got the markers that greyed out the steam subsystem from working. But still cant join the session after its created. Does anyone have any advice or know of reasons the online would not be working through steam at this point? Im even using the advanced sessions versions of create and find sessions. Any help would be appreciated

[@shrimpson123]

if you were to host on both steam and epic games at the same time would there be crossplay between these two platforms?

[@worbarry9735]

i have a issue with using the default subsytem i cant find a asnwer does it work over wan or not i understand that server browser wont work but i cant even connect with direct ip, it all works on lan and browser, but over wan even with ports forwarded and verfiied they are open clients still cant connect? does the default subsystem only work over LAN?

[@ryanpatton1795]

Finding and connecting to local sessions in Unreal has been easy, what is difficult is transferring local data from the main menu to the server you are connecting to. Lets say people set their character skin on the main menu, but when they connect to the server everything is messed up like everyone has the same skin.

[@nestalaudat3164]

On the game mode there's a note called login, you can add each player controller to an array and use that array to spawn your actors

[@prismgod1904]

@@nestalaudat3164 where is this note called login that you speak of?

[@ISDISNJH]

Following your tutorial on I got server showing up in list, but on joining the lobby the client is not seeming to have its players controller set or getting the default map setting? host is loading just fine into game. anyone else get issues with client joining not getting their controller set?

[@theepicgaminggod4275]

What about transferring session host after a set amount of time as if your internet connection happened to fail??

[@UrbexUS]

Would this be the best way to truly test how the multiplayer game is functioning and how replication is being handled? Rather than testing as listen server?

[@jasonyeo1465]

I have a question. If client A creates a session and B finds that session. Then client A destroyed it, but B doesn't know and the UI is still there. When client B starts join session, B cannot join other existing sessions because session already exists. In the output log, it keeps sending packets. How to handle this kind of situation?

[@zackseah1594]

Can it work in Pixel Streaming multiple full stacks matchmaking?

[@LuizGamingYT]

Can I use Online Subsystem for dedicated server with open world map like MMO?

[@g4lstudios621]

ran into issue, i have a destructible mesh that if i break it , and join with client after i do it is not broken on their end

[@bluehornet03]

Thanks so much for the Video, I just had a question though. Whenever I press Find Sessions it works, but only after clicking it the second time around. Have you encountered this issue?

[@bluehornet03]

If anyone gets this issue, a quick fix is just to apply do once function after you reenabled the find session btn into the find sessions.

[@serf20120]

nice tutorial and it work in one machine but not on two computers. One joined to other but nothing is happen.

[@kazp5020]

thanks for the tutorial! would you mind if i ask a question? at 11:56, I tried searching for the "SetText" node, but it doesn't come out. Am I doing something wrong?

[@Renkyys]

Drag from the "Server Name Text", "Amount of Players Text" or "Ping Text". Than search for "SetText" node

[@kazp5020]

@@Renkyys Ah! Thank you so much! It worked

[@JoeHendersonOfficial]

The node is "set text text"

[@joshmoore3785]

so if i just made this would it work online not just LAN or would i have. to intergrate EOS etc.

[@hyperatomart8]

How do you make this into an online multiplayer session and not a lan one?

[@zdroid5818]

another question i can find server that where ticked to be on lan while unticking find land while searching how do i fix this

[@starscream2092]

Everything works, but : 2 players, play standalone and when i press Join, it waits 20 seconds and spawn the player in default third person map. Is it because i need the advanced steam plugin ? It does not work without it ?

[@meeperhere]

You have a dutch accent, I am dutch too xD

[@Kekdot]

Haha, yep I’m Dutch :p

[@meeperhere]

@@Kekdot i noticed :D

[@johndavidtaylo9725]

Somehow i cant connect my 2 get player controller on find session and create join session widget for find session widget graph any idea guys ? thanks for the help blue print refference 14:00 minutes on video

[@GameDeveloper7]

hi, I am stuck please help, It totally works in the viewport but as soon as I build this It stops working on the joining part

[@character726]

where do i get the "public connections node"?

[@terrablader]

will this project work in 5.1 seems to not launch after compile when save as 5.1 copy and try it

[@giannisigona5830]

I’m a beginner and I’m trying to get my first game finished, I have packaged my game for windows and put it on 2 computers but it doesn’t see the seasons I don’t know why any help would be appreciated thanks

[@tejtuladhar2658]

I am having a problem where when I create session, the new level opens for both the server and the client. I want the client to be able to join the server. How do I do that?

[@fidel_soto]

Hi, question... Can you have multiple sessions on the same local server? Like... If I press play with 4 players on standalone (on the editor), can I split them in sessions like 2-2?

[@Kekdot]

No you can’t unfortunatly

[@JakobESG]

I've build two Local Multiplayer Version in 5.3 and in 4.27. The Odd part is, that it works in 5.3 but in 4.27 the Joining Client isnt transported to the Hosts Level / Map. Did they Change anything in the System what needs to be considert when using an older Version of unreal? Does anyone here have a solution for this? This would really help me out, thank you in advance!

[@ahmedalhawar595]

Wait so how do you get your friend to join ya? Isn't this just local hosting on your own network so your friend won't find it?

[@BCF39]

hay i was wondering if you could help me, when i try to join a server it always fails can you help me fix it

[@thehungrymonk17]

What do you need to do to make this actually connect two different computers on 2 different networks? Just for testing and funsies I followed this tutorial and added it to one of the template unreal projects and then packaged it. Ran the game on 2 different computers but after creating a session , that session was never found on the other pc when attempting to find sessions. It works fine if I do it within the editor but not on a packaged project. Or should this work and connect to different PC's on different networks as is and im just doing something wrong?

[@pleaseenteraname386]

I have the same issue. I’m still trying to figure it out. So far, I believe it may have something to do with either a need for an “Open port” on your WiFi router or some bizarre issue with Windows Defender Firewall. I’ll comment any solutions I find!

[@thehungrymonk17]

@@pleaseenteraname386 yah lmk please! I’ve been doing some research and I think maybe its because this tutorial doesn’t show how to implement an online subsystem. I think all of this would work if the subsystem was setup but the video did not cover that. I’m learning so if anyone can comment and throw me in the right direction that’d be rad. :)

[@thehungrymonk17]

@@pleaseenteraname386 hey just curious have you found a solution or got yours connected?

[@lifelife3061]

can this work with other networks or does it have to be local?

[@movte]

man this video is now 1 year old and its still so helpful. Ty man ! Do you have on patreon other courses aswell or do you have full courses to download. When i watch your video in fullscreen the top left message is annyoing at some points. Or are you on udemy or on an other learning site?

[@Kekdot]

Hi there, What kind of course would you like best? I got a bunch of knowledge I could share. Let me know and I could make some this week

[@Mr2Trickyy]

Works great however I am having one problem, I made my leave session button bring up like a pause menu for added context. when the host leaves both host and client are put back to main menu fine, the host is normal but the client that was forced out and didn't leave by clicking the button cannot interact with anything. It looks like the buttons like create and join work but nothing happens, weird this is it is possible to search for a server just not join or create? any ideas on a fix? Maybe a problem with the pause menu being brought up and using 'set Input Mode Game And UI' and back to 'Set Input Mode Game Only'?

[@Kekdot]

Yeah either that or you don’t properly destroy the session. Make sure to call ‘DestroySession’ on the client who disconnects as well.

[@12345yarg]

Thanks for the info, the only issue I have run in to that I can't identify is that when I am running my game in editor as a listen server simulating 2 people playing, sometimes when create a session it is sending both simulated players into the level immediately instead of just one player. from what I can tell I have my create session button set up exactly the same except I have removed the option to set the amount of players since my game is only 2 player. It's weird because it only happens when I create a session from the first player that is simulated (the player that plays out of the editor window by default)

[@12345yarg]

To clarify, if I click "create session" from the "server" simulated player, it sends both players into the gameplay right away. If I click create session from the "client" simulated player, it works as intended.

[@12345yarg]

If I set the net mode to 'client mode', everything works as intended. so for some reason when I have a player set up as the server, using the 'listen' net mode its not working quite as intended.

[@12345yarg]

anyone know if these simulated players have their own player controllers? or are they all sharing the player controller at index 0?

[@12345yarg]

I figured it out! I was setting my main menu up as a listen server.(manually turning on listen server from the simulation menu) I need the main menu to be in stand alone mode, then when I click create session it turns it into a listen server like we tell it to in the create session node!

[@Kekdot]

When hosting a session you are supposed to test as Standalone. Connecting to the session automatically makes you a host and client (listen server 2 players) Testing as listen server is intended for in editor when in a gameplay map so you can skip the whole creating and joining a session while testing.

[@zanispleve1777]

And how to do if there is only one live server by default and you can not create new server?

[@PraiseMore]

Hey @kekdot how do I get my lobby widget and my find sessions widget to show up when i hit play?

[@Kekdot]

Hi there, Basically you call these two events for instance on Beginplay in your player controller: 'Create widget', and then you do 'Add widget to viewport'. See the code from my player controller on 08:07 I will make some tutorials about UI basics soon!

[@chillearesticall9912]

helllo👋 nice and clean toturial🔥 and i have question.... How Can I have my own subsystem (Not Steam Or Epic) i mean how can i make server (for example with nodeJs or ....) and connect that to my game. whenever some one host game that session do stuff on my server back end. and every body can connect that from internet. for short i mean how can i and other player host game on internet without using steam or epic and the other subsystem stuff... yeah 😅

[@Kekdot]

Hi there, I have no experience with creating a subsystem from scratch, I can imagine it's a very complicated process. That's most likely why it cost Steam, EOS, Playfab and other millions of dollars a lot of engineers to realize. Not sure how one would attempt to make a subsystem network on their own. You would have to host your subsystem network somewhere in a way that it is accesible for anyone in the world to host their sessions over.

[@chillearesticall9912]

@@Kekdot ohh😥 thanks ✌ there no way to dont use steam 😅

[@Kekdot]

No you need to use one of these subsystems if you want people to be able to host sessions that can be found over a general network. Otherwise you’d have to resort to dedicated servers. Those would be hosted by you on Amazon or something and you’d pay monthly money to have them be online for people to connect to

[@chillearesticall9912]

@@Kekdot oh aha okay thanks🔥

[@WarlockSRB]

...just wanna ask, I know Fortnite was running something like 100 players in online lobbies (battle royal), what is the number of players limit in UE? And if it is known, how much of data transfer is needed for single player (on a client and on a server side)? Thanks, and keep up the good work...

[@Kekdot]

There’s no hard limit to this. It really depends on your netcode and setup to determine how many players your game can handle. Fortnite has 50.000 replicated actors, a 100 live controlled players, and achieves this by using a lot of proper netcode optimization as using Dormant Actors which are only awoken when used, and by using the Replication Graph. (Something only exposed in C++, worth checking this out in the UE docs. So because so many factors are included I nor the UE documentation can give you a static answer

[@Josh-fh5ox]

Anyone found it possible to emulate the LAN? I can see the other device but always timeout.

[@zainophrenicgaming2727]

Can you do the Video for Private host, mean only me & My friend can play no Outsider , or some kind of code like AmongUs...

[@goldkat94]

Why is your ping 34 when you are connected in your home network? This seems strange to me.

[@wiktorwicek3100]

Czy na First Person też działa? Does it also work on First Person?

[@zetwu]

i don't have "set text" option ue5, please helpppppp

[@arengnightcore5201]

what if you dont want the players to join the session when you are already in game , and how do you lock a session with a password ?

[@DIZZYplys]

When ever I Play my game in the editor It work, but when I try to play it in the standalone or the packaged file, I doesn't work, It failed to create a session, anyone knows why?

[@ZerofeverOfficial]

Is there a way to have sessions inside of sessions? I want 4 people to be able to play with each other but i have 10,000 solar systems in my game and when we're not in the same solar system we need to be in different levels, then join together when in same system. Do i need to maybe make 4 solar system levels and assign them to seperate player, then join session when together? Im lost.

[@kevinbasel8401]

Dream smaller and don't make huge game you can't finish. You just started a multiplayer tutorial

[@shivamkumar-eq3sl]

I have a question regarding the scope of the multiplayer feature, I was able to find and join sessions from 2 laptops connected to the same router, but my friend who was in a different state could not find the session. I just wanted to know if that's how its supposed to be or did I do something wrong? Also is it possible for people to join the same session from anywhere in a country using the Advanced Session plugin or do you need other stuff like steam or epic's hosting services?

[@Kekdot]

Watch the video more carefully or fully because I cover that in this video

[@shivamkumar-eq3sl]

@@Kekdot Thank you for replying, I watched the video twice but couldn't find the solution to my problem, could you point it out.

[@Kekdot]

@@shivamkumar-eq3sl Well to host games with people from different countries your game has to be on a subsystem like Steam or EOS. If you just use the default subsystem integrated in UE, or the Advanced session nodes, then your session still only lives on your local network. So uploading your game to Steam or Epic's store would be the solution.

[@shivamkumar-eq3sl]

@@Kekdot Okay, I see how it is. Thank you for your help.

[@DevinDTV]

@@Kekdot how were you connecting in your video then? you didn't have the LAN box checked and you were on 34ms? what subsystem were you using?

[@VizibilityZero]

I dont know if you still check these comments, but I followed everything and when I click create server from the server side client into multiplayer, it takes both player 1 and 2 into the new level, the result of this is one player who is the correct character, and another character (player 2) who becomes the default pawn instead. I have no idea how to fix this or even to look up how to fix it. thoughts?

[@TheSkyrim24]

Every find an answer to this?

[@CringingDragon]

Im confused how the create WB Join Session widget has a search result pin. If anyone knows how to make that happen I'd really like to know.

[@SugoiAdam284]

Add a new variable and search for Blueprint Session Result

[@yuriwang8767]

Nice tutorial ! but I don't knwo why it is not working in packaged build :( ?

[@francescogeloso79]

you solved?

[@klewyeng5034]

is this tutorial for local multiplayer? or my friend can joib