# Multiplayer & Networking **URL:** https://forums.unrealengine.com/c/development-discussion/programming-scripting/multiplayer-networking/132.md?page=1 [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) **Page:** 2 --- ## [TMap not working on client in online/replication](https://forums.unrealengine.com/t/tmap-not-working-on-client-in-online-replication/2361157)
**Author:** [@Chevidal451](https://forums.unrealengine.com/u/Chevidal451)\ **Replies:** 9\ **Last updated:** [October 21, 2026, 11:50am UTC](https://forums.unrealengine.com/t/tmap-not-working-on-client-in-online-replication/2361157 "2026-10-21T11:50:47Z")
Recently I saw that TMap was not replicated for Unreal, but if I dont want to replicate it, I just want to make calculations with the TMap structure and then if I want to replicate I will move the data to a particular st… --- ## [Replicate a UObject via Fast TArray Replication and getting the error “Attempted to send bunch exceeding max allowed size”](https://forums.unrealengine.com/t/replicate-a-uobject-via-fast-tarray-replication-and-getting-the-error-attempted-to-send-bunch-exceeding-max-allowed-size/2066569)
**Author:** [@hysecha](https://forums.unrealengine.com/u/hysecha)\ **Replies:** 2\ **Last updated:** [October 20, 2026, 7:15pm UTC](https://forums.unrealengine.com/t/replicate-a-uobject-via-fast-tarray-replication-and-getting-the-error-attempted-to-send-bunch-exceeding-max-allowed-size/2066569 "2026-10-20T19:15:11Z")
I am making a game in the survival genre. I created the items in the game as UObjects and created an inventory to hold them using FFastArraySerializer. (I used LyraStarterGame’s inventory system as a reference.) At fir… --- ## [How to replicate a UObject property inside a struct?](https://forums.unrealengine.com/t/how-to-replicate-a-uobject-property-inside-a-struct/245642)
**Author:** [@Alizia](https://forums.unrealengine.com/u/Alizia)\ **Replies:** 8\ **Last updated:** [October 20, 2026, 7:12pm UTC](https://forums.unrealengine.com/t/how-to-replicate-a-uobject-property-inside-a-struct/245642 "2026-10-20T19:12:39Z")
Hi ! I’m discovering how to replicate UObject contained in AActor (following this post Replicating UObjects: Building a Flexible Inventory System – James Baxter). My inventory system is a slot UObject contained in a USt… --- ## [Replicated UObject subobject lifetime appears bound to the original UActorChannel that created it ](https://forums.unrealengine.com/t/replicated-uobject-subobject-lifetime-appears-bound-to-the-original-uactorchannel-that-created-it/2697164)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 5\ **Last updated:** [October 20, 2026, 6:39pm UTC](https://forums.unrealengine.com/t/replicated-uobject-subobject-lifetime-appears-bound-to-the-original-uactorchannel-that-created-it/2697164 "2026-10-20T18:39:55Z")
Hello! We’re implementing an inventory system where items are replicated UObjects (subobjects) and can be moved between different owning actors/inventories at runtime (e.g. container → player inventory → dropped body → a… --- ## [Submitting UE4 dedicated server build to Playfab always gets unhealthy region.](https://forums.unrealengine.com/t/submitting-ue4-dedicated-server-build-to-playfab-always-gets-unhealthy-region/2841874)
**Author:** [@byvsen](https://forums.unrealengine.com/u/byvsen)\ **Replies:** 2\ **Last updated:** [October 20, 2026, 5:22pm UTC](https://forums.unrealengine.com/t/submitting-ue4-dedicated-server-build-to-playfab-always-gets-unhealthy-region/2841874 "2026-10-20T17:22:39Z")
I was following this tutorial to try and learn how to get a dedicated server build on Playfab. It was going well and I was able to follow all the steps. However right at the very end when submitting the server build to … --- ## [UObject replication problem in non player actor](https://forums.unrealengine.com/t/uobject-replication-problem-in-non-player-actor/2692841)
**Author:** [@Ngenion](https://forums.unrealengine.com/u/Ngenion)\ **Replies:** 4\ **Last updated:** [October 20, 2026, 3:08pm UTC](https://forums.unrealengine.com/t/uobject-replication-problem-in-non-player-actor/2692841 "2026-10-20T15:08:22Z")
Hello! I have an actor for chestbox - ABChestbox. It includes actorComponent UInventory\* inventory. UInventory have TArray (UInventoryItem) items; UInventoryItem = child of UObject All replication rules are checked, fo… --- ## [I'm having a huge problem on standalone replication](https://forums.unrealengine.com/t/im-having-a-huge-problem-on-standalone-replication/2842626)
**Author:** [@ispaterno](https://forums.unrealengine.com/u/ispaterno)\ **Replies:** 2\ **Last updated:** [October 20, 2026, 3:23am UTC](https://forums.unrealengine.com/t/im-having-a-huge-problem-on-standalone-replication/2842626 "2026-10-20T03:23:59Z")
to summarize, I would say I’m making a coop game, where players can join friends on their saves. the way I’m handling accounts atm is merely cosmetic, since I want to develop it as agnostic to EOS or SteamOS as possible… --- ## [Using ClientTravel with Steam Loads Incorrect Level ](https://forums.unrealengine.com/t/using-clienttravel-with-steam-loads-incorrect-level/2733274)
**Author:** [@BeehiveStudios](https://forums.unrealengine.com/u/BeehiveStudios)\ **Replies:** 2\ **Last updated:** [October 19, 2026, 10:41am UTC](https://forums.unrealengine.com/t/using-clienttravel-with-steam-loads-incorrect-level/2733274 "2026-10-19T10:41:25Z")
I’m trying to get a basic multi-player setup working with UE and Steam. I am using UE 5.8 with C++, Online Subsystem, Steam Sockets and Seamless Travel. I’ve started with the third person shooter project, created three m… --- ## [Character movement replication not working on moving and rotating platform / base ](https://forums.unrealengine.com/t/character-movement-replication-not-working-on-moving-and-rotating-platform-base/2701381)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 4\ **Last updated:** [October 18, 2026, 4:54pm UTC](https://forums.unrealengine.com/t/character-movement-replication-not-working-on-moving-and-rotating-platform-base/2701381 "2026-10-18T16:54:50Z")
Characters don’t replicate correctly while standing on a moving platform (= GetMovementBase()). This is especially bad when the platform also rotates, like a Viking ship theme park ride (e.g. a very big swing that the p… --- ## [Respawn dead player with on checkpoints in multiplayer](https://forums.unrealengine.com/t/respawn-dead-player-with-on-checkpoints-in-multiplayer/467485)
**Author:** [@anonymous\_user\_7eb4a778](https://forums.unrealengine.com/u/anonymous_user_7eb4a778)\ **Replies:** 2\ **Last updated:** [October 18, 2026, 4:48pm UTC](https://forums.unrealengine.com/t/respawn-dead-player-with-on-checkpoints-in-multiplayer/467485 "2026-10-18T16:48:04Z")
Hi, I created a multiplayer game following UE4 tutorial for Steam. I also created a checkpoint/respawn system which works perfect in a single player game mode but the checkpoint/respawn system does not work properly in … --- ## [Side-Scroller Shooter, how do I replicate mouse rotation?](https://forums.unrealengine.com/t/side-scroller-shooter-how-do-i-replicate-mouse-rotation/435934)
**Author:** [@anonymous\_user\_6decf5ce](https://forums.unrealengine.com/u/anonymous_user_6decf5ce)\ **Replies:** 1\ **Last updated:** [October 18, 2026, 4:34pm UTC](https://forums.unrealengine.com/t/side-scroller-shooter-how-do-i-replicate-mouse-rotation/435934 "2026-10-18T16:34:33Z")
Hi, I am making a Side-Scroller Shooter. I was able to replicate many things to multiplayer, except for this controller scheme that works fine in singleplayer, but that I simply could not get it to work in multiplayer I… --- ## [Chaos Destruction replication don't work with ForceDynamicSwitch (DynamicState field)](https://forums.unrealengine.com/t/chaos-destruction-replication-dont-work-with-forcedynamicswitch-dynamicstate-field/1845191)
**Author:** [@laymard\_ME](https://forums.unrealengine.com/u/laymard_ME)\ **Replies:** 1\ **Last updated:** [October 18, 2026, 10:57am UTC](https://forums.unrealengine.com/t/chaos-destruction-replication-dont-work-with-forcedynamicswitch-dynamicstate-field/1845191 "2026-10-18T10:57:42Z")
Hello there ! I am making GeometryCollectionActor inside AnchorField. I am spawning the blueprint FS\_MasterField provided by the engine in order to destroy the mesh. The FS\_MasterField has the property ForceDynamicFie… --- ## [Smooth Replication of Moving Platforms or Spline-Based Actors in Multiplayer (Listen Server)](https://forums.unrealengine.com/t/smooth-replication-of-moving-platforms-or-spline-based-actors-in-multiplayer-listen-server/2664245)
**Author:** [@lFearlessBanana](https://forums.unrealengine.com/u/lFearlessBanana)\ **Replies:** 2\ **Last updated:** [October 18, 2026, 10:47am UTC](https://forums.unrealengine.com/t/smooth-replication-of-moving-platforms-or-spline-based-actors-in-multiplayer-listen-server/2664245 "2026-10-18T10:47:18Z")
In Unreal Engine 5 multiplayer (listen server), how can I properly replicate a moving actor (like a moving platform or spline-based mesh) so that both client and server see the same smooth motion without stuttering? --- ## [Correctly replicate platform ?](https://forums.unrealengine.com/t/correctly-replicate-platform/2513726)
**Author:** [@Pierrax](https://forums.unrealengine.com/u/Pierrax)\ **Replies:** 1\ **Last updated:** [October 18, 2026, 9:32am UTC](https://forums.unrealengine.com/t/correctly-replicate-platform/2513726 "2026-10-18T09:32:11Z")
Hi guys, i’m having a real trouble, my character client side has jittery movement on platform that are moving I’m using timelines or set actor, set scene world location, relative location, whatever, with replicated chec… --- ## [Catching/Blocking Alt+f4 in Packaged Game](https://forums.unrealengine.com/t/catching-blocking-alt-f4-in-packaged-game/348273)
**Author:** [@Atomik17](https://forums.unrealengine.com/u/Atomik17)\ **Replies:** 5\ **Last updated:** [October 16, 2026, 6:02pm UTC](https://forums.unrealengine.com/t/catching-blocking-alt-f4-in-packaged-game/348273 "2026-10-16T18:02:50Z")
Hello, I would like to catch the event of an “alt+f’4” command from a player, in order to do proper exit (Save of the progress/clean…). Is there a way to achieve this inside UE4 ? If not, is it possible to block totall… --- ## [Survey: the hardest UE5 multiplayer / GAS problem you hit in the last 90 days (2 min)](https://forums.unrealengine.com/t/survey-the-hardest-ue5-multiplayer-gas-problem-you-hit-in-the-last-90-days-2-min/2841523)
**Author:** [@LMXLion](https://forums.unrealengine.com/u/LMXLion)\ **Replies:** 0\ **Last updated:** [October 16, 2026, 7:48am UTC](https://forums.unrealengine.com/t/survey-the-hardest-ue5-multiplayer-gas-problem-you-hit-in-the-last-90-days-2-min/2841523 "2026-10-16T07:48:33Z")
Hi fellow developers, I’m collecting real-world cases (desync, prediction, GAS in multiplayer, dedicated servers, performance) to see which ones cost teams the most time. All questions are optional and anonymous unless … --- ## [UE5 Dedicated Server Steam Session Connection Issue - "ValidP2P\[0\] ValidHost\[1\] ConnectionMethod\[P2P\]"](https://forums.unrealengine.com/t/ue5-dedicated-server-steam-session-connection-issue-validp2p-0-validhost-1-connectionmethod-p2p/2835408)
**Author:** [@Waleri\_i](https://forums.unrealengine.com/u/Waleri_i)\ **Replies:** 2\ **Last updated:** [October 10, 2026, 4:55pm UTC](https://forums.unrealengine.com/t/ue5-dedicated-server-steam-session-connection-issue-validp2p-0-validhost-1-connectionmethod-p2p/2835408 "2026-10-10T16:55:37Z")
Hello everyone, I’m currently developing a multiplayer game in Unreal Engine 5.6 and facing a persistent issue with connecting to a Dedicated Server via Steam Online Subsystem (OSS). My client successfully finds the De… --- ## [the nurse of egypt ](https://forums.unrealengine.com/t/the-nurse-of-egypt/2838637)
**Author:** [@toni-yourdad](https://forums.unrealengine.com/u/toni-yourdad)\ **Replies:** 1\ **Last updated:** [October 10, 2026, 1:14am UTC](https://forums.unrealengine.com/t/the-nurse-of-egypt/2838637 "2026-10-10T01:14:39Z")
can i make a game --- ## [Iris - Exporting actor components using an index as opposed to a NetRefHandle? ](https://forums.unrealengine.com/t/iris-exporting-actor-components-using-an-index-as-opposed-to-a-netrefhandle/2851878)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 4\ **Last updated:** [October 8, 2026, 2:27pm UTC](https://forums.unrealengine.com/t/iris-exporting-actor-components-using-an-index-as-opposed-to-a-netrefhandle/2851878 "2026-10-08T14:27:09Z")
Hello, Our game requires that we consistently spawn a lot of AI and those AI characters make heavy use of replicated components (20+ components). The result of this heavily componentized approach is that spawning a sing… --- ## [Issues about joining a session with the Advance Session Steam plugin ](https://forums.unrealengine.com/t/issues-about-joining-a-session-with-the-advance-session-steam-plugin/2743644)
**Author:** [@ZADIG](https://forums.unrealengine.com/u/ZADIG)\ **Replies:** 4\ **Last updated:** [October 8, 2026, 12:29am UTC](https://forums.unrealengine.com/t/issues-about-joining-a-session-with-the-advance-session-steam-plugin/2743644 "2026-10-08T00:29:25Z")
I’m trying to use the Advance Session plugin and when I launch the game with 2 players in Stand Alone mode, I can create one using the CreateAdvancedSession node, and this works. But when I want to join with my oither sc… --- ## [Steam Achievements WITHOUT triggering Windows Firewall popup](https://forums.unrealengine.com/t/steam-achievements-without-triggering-windows-firewall-popup/2833082)
**Author:** [@toomuchabstracti](https://forums.unrealengine.com/u/toomuchabstracti)\ **Replies:** 3\ **Last updated:** [October 8, 2026, 12:23am UTC](https://forums.unrealengine.com/t/steam-achievements-without-triggering-windows-firewall-popup/2833082 "2026-10-08T00:23:54Z")
I followed this tutorial for setting up Steam achievements: And it worked. However, now when I try to launch a packaged build, I get a Windows Firewall popup. This previously did not happen. I’m using a Shipping build… --- ## [\[Tutorial\] Proper Multiplayer Linetrace from camera](https://forums.unrealengine.com/t/tutorial-proper-multiplayer-linetrace-from-camera/1229523)
**Author:** [@Rev0verDrive](https://forums.unrealengine.com/u/Rev0verDrive)\ **Replies:** 11\ **Last updated:** [October 7, 2026, 4:03pm UTC](https://forums.unrealengine.com/t/tutorial-proper-multiplayer-linetrace-from-camera/1229523 "2026-10-07T16:03:55Z")
When I code multiplayer mechanics I do so with a few base rules. Don’t ever trust the client. Don’t waste bandwidth replicating data you don’t need to. In many multiplayer scenarios we need to execute line traces. One… --- ## [Picking up item with physics not replicating](https://forums.unrealengine.com/t/picking-up-item-with-physics-not-replicating/1841380)
**Author:** [@Kev\_Dogg](https://forums.unrealengine.com/u/Kev_Dogg)\ **Replies:** 6\ **Last updated:** [October 7, 2026, 12:11pm UTC](https://forums.unrealengine.com/t/picking-up-item-with-physics-not-replicating/1841380 "2026-10-07T12:11:05Z")
I recently followed this tutorial https://youtu.be/wQGnf-YmnhE?si=JOoCMFIZILE6pcCh which sets up blueprints to pickup items using physics and it works great. I tried adding a rpc which allows me to actually pick up the … --- ## [2 Player Controllable Vehicle in Blueprints](https://forums.unrealengine.com/t/2-player-controllable-vehicle-in-blueprints/2696408)
**Author:** [@ErWiNY](https://forums.unrealengine.com/u/ErWiNY)\ **Replies:** 5\ **Last updated:** [October 7, 2026, 12:04pm UTC](https://forums.unrealengine.com/t/2-player-controllable-vehicle-in-blueprints/2696408 "2026-10-07T12:04:10Z")
I’m developing a coop game that is on Listen Server and I want to add a vehicle that is possessed by the driver that has steering wheel controls and a passenger that has throttle and brake controls. I currently have the… --- ## [Ue 5.5 physics handle replication issue](https://forums.unrealengine.com/t/ue-5-5-physics-handle-replication-issue/2449462)
**Author:** [@DeathFart](https://forums.unrealengine.com/u/DeathFart)\ **Replies:** 1\ **Last updated:** [October 7, 2026, 11:48am UTC](https://forums.unrealengine.com/t/ue-5-5-physics-handle-replication-issue/2449462 "2026-10-07T11:48:43Z")
Hello Everyone, I am having an issue with creating a grab and hold / drop system over multiplayer. However I have not been able to lift this project off the ground because already I seem to be having an issue with it. I… --- ## [\[UE5, Chaos Vehicles\] ServerUpdateState permanently rejected ("No owning connection for actor") after manual delayed Possess()](https://forums.unrealengine.com/t/ue5-chaos-vehicles-serverupdatestate-permanently-rejected-no-owning-connection-for-actor-after-manual-delayed-possess/2742191)
**Author:** [@menacing0ne](https://forums.unrealengine.com/u/menacing0ne)\ **Replies:** 2\ **Last updated:** [October 7, 2026, 11:45am UTC](https://forums.unrealengine.com/t/ue5-chaos-vehicles-serverupdatestate-permanently-rejected-no-owning-connection-for-actor-after-manual-delayed-possess/2742191 "2026-10-07T11:45:19Z")
\[UE5, Chaos Vehicles\] ServerUpdateState permanently rejected (“No owning connection for actor”) after manual delayed Possess() — Owner/Controller/Role all correct Engine version: UE5.8.1 (Chaos Vehicles plugin) Networkin… --- ## [Client side replication is jittering](https://forums.unrealengine.com/t/client-side-replication-is-jittering/2683735)
**Author:** [@9Evgeny9](https://forums.unrealengine.com/u/9Evgeny9)\ **Replies:** 5\ **Last updated:** [October 7, 2026, 11:23am UTC](https://forums.unrealengine.com/t/client-side-replication-is-jittering/2683735 "2026-10-07T11:23:24Z")
I have replicated Actor “Cube“, with settings Also root of actor is StaticMeshComponent (with cube.fbx) When i interact with Cube on listen server, interaction is smooth, but on client side interaction is jittering.… --- ## [OSSv2 does not work with dedicated servers ](https://forums.unrealengine.com/t/ossv2-does-not-work-with-dedicated-servers/2836637)
**Author:** [@Dominique\_Lorre](https://forums.unrealengine.com/u/Dominique_Lorre)\ **Replies:** 0\ **Last updated:** [October 2, 2026, 5:41pm UTC](https://forums.unrealengine.com/t/ossv2-does-not-work-with-dedicated-servers/2836637 "2026-10-02T17:41:11Z")
Since I have upgraded to OSSv2 I noticed that it does not support dedicated servers. The EOS SDK does support them, but OSSv2 requires an account ID that dedicated servers do not have. So, rather than moving back to OSSv… --- ## [PIE with Network Simulation shows other players jittery on server](https://forums.unrealengine.com/t/pie-with-network-simulation-shows-other-players-jittery-on-server/2832611)
**Author:** [@illYay](https://forums.unrealengine.com/u/illYay)\ **Replies:** 5\ **Last updated:** [September 30, 2026, 9:03am UTC](https://forums.unrealengine.com/t/pie-with-network-simulation-shows-other-players-jittery-on-server/2832611 "2026-09-30T09:03:46Z")
I’ve been testing networking in PIE and have network simulation enabled with the worst settings. I play with 3 players and listen server mode, so 2 other windows open for clients and the PIE window is the server. The c… --- ## [Free UE4 Multiplayer Template Project - Listen Server, Steam](https://forums.unrealengine.com/t/free-ue4-multiplayer-template-project-listen-server-steam/116833)
**Author:** [@hamaro02](https://forums.unrealengine.com/u/hamaro02)\ **Replies:** 51\ **Last updated:** [September 29, 2026, 6:04pm UTC](https://forums.unrealengine.com/t/free-ue4-multiplayer-template-project-listen-server-steam/116833 "2026-09-29T18:04:25Z")
UE4 Multiplayer Template Hi All. I made this project because I think multiplayer games share most menu features. I thought it would be nice to not have to start over from scratch, every time I try some n… [Previous page](https://forums.unrealengine.com/c/development-discussion/programming-scripting/multiplayer-networking/132.md) [Next page](https://forums.unrealengine.com/c/development-discussion/programming-scripting/multiplayer-networking/132.md?page=2)