2.4.0

[2.4.0] - 2025-06-02

Added

• Added SinglePlayerTransport that provides the ability to start as a host for a single player network session. (#3473)
• When using UnityTransport >=2.4 and Unity >= 6000.1.0a1, SetConnectionData will accept a fully qualified hostname instead of an IP as a connect address on the client side. (#3441)

Fixed

• Fixed issue where the NetworkObject.DontDestroyWithOwner was not being honored. (#3477)
• Fixed issue where non-authority NetworkTransform instances would not allow non-synchronized axis values to be updated locally. (#3471)
• Fixed issue where invoking NetworkObject.NetworkShow and NetworkObject.ChangeOwnership consecutively within the same call stack location could result in an unnecessary change in ownership error message generated on the target client side. (#3468)
• Fixed issue where NetworkVariables on a NetworkBehaviour could fail to synchronize changes if one has NetworkVariableUpdateTraits set and is dirty but is not ready to send. (#3466)
• Fixed issue with the Distributed Authority connection sequence with scene management enabled where the ClientConnected event was fired before the client was synchronized. (#3459)
• Fixed inconsistencies in the OnSceneEvent callback. (#3458)
• Fixed issues with the NetworkBehaviour and NetworkVariable length safety checks. (#3405)
• Fixed memory leaks when domain reload is disabled. (#3427)
• Fixed issue where disabling the physics or physics2D package modules could result in a compilation error. (#3422)
• Fixed an exception being thrown when unregistering a custom message handler from within the registered callback. (#3417)

1.13.0

[1.13.0] - 2025-04-30

Added

• Added NetworkManager.OnPreShutdown which is called before the NetworkManager cleans up and shuts down. (#3358)
• Added FastBufferReader(ArraySegment<byte> buffer, Allocator copyAllocator) constructor that uses the ArraySegment.Offset as the FastBufferReader offset and the ArraySegment.Count as the FastBufferReader length. (#3320)
• Added FastBufferReader(ArraySegment<byte> buffer, Allocator copyAllocator, int length = -1) constructor that uses the ArraySegment.Offset as the FastBufferReader offset. (#3320)

Fixed

• Fixed memory leaks when domain reload is disabled. (#3428)
• Fixed issues with the NetworkBehaviour and NetworkVariable length safety checks. (#3415)
• Fixed issue where during a NetworkObject's spawn if you instantiated, spawned, and parented another network prefab under the currently spawning NetworkObject the parenting message would not properly defer until the parent NetworkObject was spawned. (#3403)
• Fixed issue where in-scene placed NetworkObjects could fail to synchronize its transform properly (especially without a NetworkTransform) if their parenting changes from the default when the scene is loaded and if the same scene remains loaded between network sessions while the parenting is completely different from the original hierarchy. (#3388)
• Fixed an issue in UnityTransport where the transport would accept sends on invalid connections, leading to a useless memory allocation and confusing error message. (#3383)
• Fixed issue where NetworkAnimator would log an error if there was no destination transition information. (#3384)
• Fixed initial NetworkTransform spawn, ensure it uses world space. (#3361)
• Fixed issue where AnticipatedNetworkVariable previous value returned by AnticipatedNetworkVariable.OnAuthoritativeValueChanged is updated correctly on the non-authoritative side. (#3322)

Changed

• Changed the scene loading event serialization order for in-scene placed NetworkObjects to be based on their parent-child hierarchy. (#3388)

2.3.2

[2.3.2] - 2025-04-22

Fixed

• Fixed issue where the authority instance of NetworkTransform could check for state updates more than one time in a frame if the frame rate is greater than the tick frequency. (#3413)
• Fixed issue where the new interpolator types were blocking after the first consumption of a sequence of buffered state updates. (#3413)
• Fixed issue where root level in-scene placed NetworkObjects would only allow the ownership permission to be no less than distributable or sessionowner. (#3407)

2.3.1

Fixed

• Fixed issue where during a NetworkObject's spawn if you instantiated, spawned, and parented another network prefab under the currently spawning NetworkObject the parenting message would not properly defer until the parent NetworkObject was spawned. (#3401)

2.3.0

Added

• Added NetworkManager.OnPreShutdown which is called before the NetworkManager cleans up and shuts down. (#3366)
• Added Lerp interpolation type that still uses a lerp approach but uses the new buffer consumption logic. (#3355)
• Added property to enable or disable lerp smoothing for position, rotation, and scale interpolators. (#3355)
• Added NetworkTransform.InterpolationBufferTickOffset static property to provide users with a way to increase or decrease the time marker where interpolators will pull state update from the queue. (#3355)
• Added interpolator types as an inspector view selection for position, rotation, and scale. (#3337)
• Added a new smooth dampening interpolator type that provides a nice balance between precision and smoothing results. (#3337)
• Added NetworkTimeSystem.TickLatency property that provides the average latency of a client. (#3337)
• Added FastBufferReader(ArraySegment<byte> buffer, Allocator copyAllocator) constructor that uses the ArraySegment.Offset as the FastBufferReader offset and the ArraySegment.Count as the FastBufferReader length. (#3321)
• Added FastBufferReader(ArraySegment<byte> buffer, Allocator copyAllocator, int length = -1) constructor that uses the ArraySegment.Offset as the FastBufferReader offset. (#3321)

Fixed

• Fixed issue where in-scene placed NetworkObjects could fail to synchronize its transform properly (especially without a NetworkTransform) if their parenting changes from the default when the scene is loaded and if the same scene remains loaded between network sessions while the parenting is completely different from the original hierarchy. (#3387)
• Fixed an issue in UnityTransport where the transport would accept sends on invalid connections, leading to a useless memory allocation and confusing error message. (#3382)
• Fixed issue where the time delta that interpolators used would not be properly updated during multiple fixed update invocations within the same player loop frame. (#3355)
• Fixed issue when using a distributed authority network topology and many clients attempt to connect simultaneously the session owner could max-out the maximum in-flight reliable messages allowed, start dropping packets, and some of the connecting clients would fail to fully synchronize. (#3350)
• Fixed issue when using a distributed authority network topology and scene management was disabled clients would not be able to spawn any new network prefab instances until synchronization was complete. (#3350)
• Fixed issue where an owner that changes ownership, when using a distributed authority network topology, could yield identical previous and current owner identifiers. This could also cause NetworkTransform to fail to change ownership which would leave the previous owner still subscribed to network tick events. (#3347)
• Fixed issue where the MaximumInterpolationTime could not be modified from within the inspector view or runtime. (#3337)
• Fixed ChangeOwnership changing ownership to clients that are not observers. This also happened with automated object distribution. (#3323)
• Fixed issue where AnticipatedNetworkVariable previous value returned by AnticipatedNetworkVariable.OnAuthoritativeValueChanged is updated correctly on the non-authoritative side. (#3306)
• Fixed OnClientConnectedCallback passing incorrect clientId when scene management is disabled. (#3312)
• Fixed issue where the NetworkObject.Ownership custom editor did not take the default "Everything" flag into consideration. (#3305)
• Fixed DestroyObject flow on non-authority game clients. (#3291)
• Fixed exception being thrown when a GameObject with an associated NetworkTransform is disabled. (#3243)
• Fixed issue where the scene migration synchronization table was not cleaned up if the GameObject of a NetworkObject is destroyed before it should have been. (#3230)
• Fixed issue where the scene migration synchronization table was not cleaned up upon NetworkManager shutting down. (#3230)
• Fixed NetworkObject.DeferDespawn to respect the DestroyGameObject parameter. (#3219)
• Fixed issue where a NetworkObject with nested NetworkTransform components of varying authority modes was not being taken into consideration and would break both the initial NetworkTransform synchronization and fail to properly handle synchronized state updates of the nested NetworkTransform components. (#3209)
• Fixed issue with distributing parented children that have the distributable and/or transferrable permissions set and have the same owner as the root parent, that has the distributable permission set, were not being distributed to the same client upon the owning client disconnecting when using a distributed authority network topology. (#3203)
• Fixed issue where a spawned NetworkObject that was registered with a prefab handler and owned by a client would invoke destroy more than once on the host-server side if the client disconnected while the NetworkObject was still spawned. (#3200)
• Fixed issue where NetworkVariableBase derived classes were not being re-initialized if the associated NetworkObject instance was not destroyed and re-spawned. (#3181)

Changed

• Changed the scene loading event serialization order for in-scene placed NetworkObjects to be based on their parent-child hierarchy. (#3387)
• Changed the original Lerp interpolation type to LegacyLerp. (#3355)
• Changed BufferedLinearInterpolator<T>.Update(float deltaTime, NetworkTime serverTime) as being deprecated since this method is only used for internal testing purposes. (#3337)
• Changed error thrown when attempting to build a dedicated server with Unity Transport that uses websockets to provide more useful information to the user. (#3336)
• Changed root in-scene placed NetworkObject instances now will always have either the Distributable permission set unless the SessionOwner permission is set. (#3305)
• Changed the DestroyObject message to reduce the serialized message size and remove the unnecessary message field. (#3304)
• Changed the NetworkTimeSystem.Sync method to use half RTT to calculate the desired local time offset as opposed to the full RTT. (#3212)

2.2.0

[2.2.0] - 2024-12-12

Added

• Added NetworkObject.OwnershipStatus.SessionOwner to allow Network Objects to be distributable and only owned by the Session Owner. This flag will override all other OwnershipStatus flags. (#3175)
• Added UnityTransport.GetEndpoint method to provide a way to obtain NetworkEndpoint information of a connection via client identifier. (#3130)
• Added NetworkTransport.OnEarlyUpdate and NetworkTransport.OnPostLateUpdate methods to provide more control over handling transport related events at the start and end of each frame. (#3113)

Fixed

• Fixed issue where the server, host, or session owner would not populate the in-scene place NetworkObject table if the scene was loaded prior to starting the NetworkManager. (#3177)
• Fixed issue where the NetworkObjectIdHash value could be incorrect when entering play mode while still in prefab edit mode with pending changes and using MPPM. (#3162)
• Fixed issue where a sever only NetworkManager instance would spawn the actual NetworkPrefab's GameObject as opposed to creating an instance of it. (#3160)
• Fixed issue where only the session owner (as opposed to all clients) would handle spawning prefab overrides properly when using a distributed authority network topology. (#3160)
• Fixed issue where an exception was thrown when calling NetworkManager.Shutdown after calling UnityTransport.Shutdown. (#3118)
• Fixed issue where NetworkList properties on in-scene placed NetworkObjects could cause small memory leaks when entering playmode. (#3147)
• Fixed in-scene NertworkObject synchronization issue when loading a scene with currently connected clients connected to a session created by a NetworkManager started as a server (i.e. not as a host). (#3133)
• Fixed issue where a NetworkManager started as a server would not add itself as an observer to in-scene placed NetworkObjects instantiated and spawned by a scene loading event. (#3133)
• Fixed issue where spawning a player using NetworkObject.InstantiateAndSpawn or NetworkSpawnManager.InstantiateAndSpawn would not update the NetworkSpawnManager.PlayerObjects or assign the newly spawned player to the NetworkClient.PlayerObject. (#3122)
• Fixed issue where queued UnitTransport (NetworkTransport) message batches were being sent on the next frame. They are now sent at the end of the frame during PostLateUpdate. (#3113)
• Fixed issue where NotOwnerRpcTarget or OwnerRpcTarget were not using their replacements NotAuthorityRpcTarget and AuthorityRpcTarget which would invoke a warning. (#3111)
• Fixed issue where client is removed as an observer from spawned objects when their player instance is despawned. (#3110)
• Fixed issue where NetworkAnimator would statically allocate write buffer space for Animator parameters that could cause a write error if the number of parameters exceeded the space allocated. (#3108)

Changed

• In-scene placed NetworkObjects have been made distributable when balancing object distribution after a connection event. (#3175)
• Optimised NetworkVariable and NetworkTransform related packets when in Distributed Authority mode.
• The Debug Simulator section of the Unity Transport component was removed. This section was not functional anymore and users are now recommended to use the more featureful Network Simulator tool from the Multiplayer Tools package instead. (#3121)

1.12.0

[1.12.0] - 2024-11-19

Added

• Added UnityTransport.GetEndpoint method to provide a way to obtain NetworkEndpoint information of a connection via client identifier. (#3131)
• Added a static NetworkManager.OnInstantiated event notification to be able to track when a new NetworkManager instance has been instantiated. (#3089)
• Added a static NetworkManager.OnDestroying event notification to be able to track when an existing NetworkManager instance is being destroyed. (#3089)
• Added message size validation to named and unnamed message sending functions for better error messages. (#3043)
• Added "Check for NetworkObject Component" property to the Multiplayer->Netcode for GameObjects project settings. When disabled, this will bypass the in-editor NetworkObject check on NetworkBehaviour components. (#3034)

Fixed

• Fixed issue where NetworkList properties on in-scene placed NetworkObjects could cause small memory leaks when entering playmode. (#3148)
• Fixed issue where a newly synchronizing client would be synchronized with the current NetworkVariable values always which could cause issues with collections if there were any pending state updates. Now, when initially synchronizing a client, if a NetworkVariable has a pending state update it will serialize the previously known value(s) to the synchronizing client so when the pending updates are sent they aren't duplicate values on the newly connected client side. (#3126)
• Fixed issue where changing ownership would mark every NetworkVariable dirty. Now, it will only mark any NetworkVariable with owner read permissions as dirty and will send/flush any pending updates to all clients prior to sending the change in ownership message. (#3126)
• Fixed issue with NetworkVariable collections where transferring ownership to another client would not update the new owner's previous value to the most current value which could cause the last/previous added value to be detected as a change when adding or removing an entry (as long as the entry removed was not the last/previously added value). (#3126)
• Fixed issue where a client (or server) with no write permissions for a NetworkVariable using a standard .NET collection type could still modify the collection which could cause various issues depending upon the modification and collection type. (#3126)
• Fixed issue where NetworkAnimator would statically allocate write buffer space for Animator parameters that could cause a write error if the number of parameters exceeded the space allocated. (#3124)
• Fixed issue with the in-scene network prefab instance update menu tool where it was not properly updating scenes when invoked on the root prefab instance. (#3084)
• Fixed issue where NetworkAnimator would send updates to non-observer clients. (#3058)
• Fixed issue where an exception could occur when receiving a universal RPC for a NetworkObject that has been despawned. (#3055)
• Fixed issue where setting a prefab hash value during connection approval but not having a player prefab assigned could cause an exception when spawning a player. (#3046)
• Fixed issue where collections v2.2.x was not supported when using UTP v2.2.x within Unity v2022.3. (#3033)
• Fixed issue where the NetworkSpawnManager.HandleNetworkObjectShow could throw an exception if one of the NetworkObject components to show was destroyed during the same frame. (#3029)
• Fixed issue where the NetworkManagerHelper was continuing to check for hierarchy changes when in play mode. (#3027)

Changed

• Changed NetworkVariableDeltaMessage so the server now forwards delta state updates (owner write permission based from a client) to other clients immediately as opposed to keeping a NetworkVariable or NetworkList dirty and processing them at the end of the frame or potentially on the next network tick. (#3126)
• The Debug Simulator section of the Unity Transport component will now be hidden if Unity Transport 2.0 or later is installed. It was already non-functional in that situation and users should instead use the more featureful Network Simulator tool from the Multiplayer Tools package. (#3120)

2.1.1

[2.1.1] - 2024-10-18

Added

• Added ability to edit the NetworkConfig.AutoSpawnPlayerPrefabClientSide within the inspector view. (#3097)
• Added IContactEventHandlerWithInfo that derives from IContactEventHandler that can be updated per frame to provide ContactEventHandlerInfo information to the RigidbodyContactEventManager when processing collisions. (#3094)
  • ContactEventHandlerInfo.ProvideNonRigidBodyContactEvents: When set to true, non-Rigidbody collisions with the registered Rigidbody will generate contact event notifications. (#3094)
  • ContactEventHandlerInfo.HasContactEventPriority: When set to true, the Rigidbody will be prioritized as the instance that generates the event if the Rigidbody colliding does not have priority. (#3094)
• Added a static NetworkManager.OnInstantiated event notification to be able to track when a new NetworkManager instance has been instantiated. (#3088)
• Added a static NetworkManager.OnDestroying event notification to be able to track when an existing NetworkManager instance is being destroyed. (#3088)

Fixed

• Fixed issue where NetworkPrefabProcessor would not mark the prefab list as dirty and prevent saving the DefaultNetworkPrefabs asset when only imports or only deletes were detected.(#3103)
• Fixed an issue where nested NetworkTransform components in owner authoritative mode cleared their initial settings on the server, causing improper synchronization. (#3099)
• Fixed issue with service not getting synchronized with in-scene placed NetworkObject instances when a session owner starts a SceneEventType.Load event. (#3096)
• Fixed issue with the in-scene network prefab instance update menu tool where it was not properly updating scenes when invoked on the root prefab instance. (#3092)
• Fixed an issue where newly synchronizing clients would always receive current NetworkVariable values, potentially causing issues with collections if there were pending updates. Now, pending state updates serialize previous values to avoid duplicates on new clients. (#3081)
• Fixed issue where changing ownership would mark every NetworkVariable dirty. Now, it will only mark any NetworkVariable with owner read permissions as dirty and will send/flush any pending updates to all clients prior to sending the change in ownership message. (#3081)
• Fixed an issue where transferring ownership of NetworkVariable collections didn't update the new owner’s previous value, causing the last added value to be detected as a change during additions or removals. (#3081)
• Fixed issue where a client (or server) with no write permissions for a NetworkVariable using a standard .NET collection type could still modify the collection which could cause various issues depending upon the modification and collection type. (#3081)
• Fixed issue where applying the position and/or rotation to the NetworkManager.ConnectionApprovalResponse when connection approval and auto-spawn player prefab were enabled would not apply the position and/or rotation when the player prefab was instantiated. (#3078)
• Fixed issue where NetworkObject.SpawnWithObservers was not being honored when spawning the player prefab. (#3077)
• Fixed issue with the client count not being correct on the host or server side when a client disconnects itself from a session. (#3075)

Changed

• Changed NetworkConfig.AutoSpawnPlayerPrefabClientSide is no longer automatically set when starting NetworkManager. (#3097)
• Updated NetworkVariableDeltaMessage so the server now forwards delta state updates from clients immediately, instead of waiting until the end of the frame or the next network tick. (#3081)

2.0.0

[2.0.0] - 2024-09-12

Added

• Added tooltips for all of the NetworkObject component's properties. (#3052)
• Added message size validation to named and unnamed message sending functions for better error messages. (#3049)
• Added "Check for NetworkObject Component" property to the Multiplayer->Netcode for GameObjects project settings. When disabled, this will bypass the in-editor NetworkObject check on NetworkBehaviour components. (#3031)
• Added NetworkTransform.SwitchTransformSpaceWhenParented property that, when enabled, will handle the world to local, local to world, and local to local transform space transitions when interpolation is enabled. (#3013)
• Added NetworkTransform.TickSyncChildren that, when enabled, will tick synchronize nested and/or child NetworkTransform components to eliminate any potential visual jittering that could occur if the NetworkTransform instances get into a state where their state updates are landing on different network ticks. (#3013)
• Added NetworkObject.AllowOwnerToParent property to provide the ability to allow clients to parent owned objects when running in a client-server network topology. (#3013)
• Added NetworkObject.SyncOwnerTransformWhenParented property to provide a way to disable applying the server's transform information in the parenting message on the client owner instance which can be useful for owner authoritative motion models. (#3013)
• Added NetcodeEditorBase editor helper class to provide easier modification and extension of the SDK's components. (#3013)

Fixed

• Fixed issue where NetworkAnimator would send updates to non-observer clients. (#3057)
• Fixed issue where an exception could occur when receiving a universal RPC for a NetworkObject that has been despawned. (#3052)
• Fixed issue where a NetworkObject hidden from a client that is then promoted to be session owner was not being synchronized with newly joining clients.(#3051)
• Fixed issue where clients could have a wrong time delta on NetworkVariableBase which could prevent from sending delta state updates. (#3045)
• Fixed issue where setting a prefab hash value during connection approval but not having a player prefab assigned could cause an exception when spawning a player. (#3042)
• Fixed issue where the NetworkSpawnManager.HandleNetworkObjectShow could throw an exception if one of the NetworkObject components to show was destroyed during the same frame. (#3030)
• Fixed issue where the NetworkManagerHelper was continuing to check for hierarchy changes when in play mode. (#3026)
• Fixed issue with newly/late joined clients and NetworkTransform synchronization of parented NetworkObject instances. (#3013)
• Fixed issue with smooth transitions between transform spaces when interpolation is enabled (requires NetworkTransform.SwitchTransformSpaceWhenParented to be enabled). (#3013)

Changed

• Changed NetworkTransformEditor now uses NetworkTransform as the base type class to assure it doesn't display a foldout group when using the base NetworkTransform component class. (#3052)
• Changed NetworkAnimator.Awake is now a protected virtual method. (#3052)
• Changed when invoking NetworkManager.ConnectionManager.DisconnectClient during a distributed authority session a more appropriate message is logged. (#3052)
• Changed NetworkTransformEditor so it now derives from NetcodeEditorBase. (#3013)
• Changed NetworkRigidbodyBaseEditor so it now derives from NetcodeEditorBase. (#3013)
• Changed NetworkManagerEditor so it now derives from NetcodeEditorBase. (#3013)

1.11.0

[1.11.0] - 2024-08-20

Added

• Added NetworkVariable.CheckDirtyState that is to be used in tandem with collections in order to detect whether the collection or an item within the collection has changed. (#3005)

Fixed

• Fixed issue by adding null checks in NetworkVariableBase.CanClientRead and NetworkVariableBase.CanClientWrite methods to ensure safe access to NetworkBehaviour. (#3011)
• Fixed issue using collections within NetworkVariable where the collection would not detect changes to items or nested items. (#3005)
• Fixed issue where List, Dictionary, and HashSet collections would not uniquely duplicate nested collections. (#3005)
• Fixed Issue where a state with dual triggers, inbound and outbound, could cause a false layer to layer state transition message to be sent to non-authority NetworkAnimator instances and cause a warning message to be logged. (#2999)
• Fixed issue where FixedStringSerializer<T> was using NetworkVariableSerialization<byte>.AreEqual to determine if two bytes were equal causes an exception to be thrown due to no byte serializer having been defined. (#2992)

Changed

• Changed permissions exception thrown in NetworkList to exiting early with a logged error that is now a unified permissions message within NetworkVariableBase. (#3005)
• Changed permissions exception thrown in NetworkVariable.Value to exiting early with a logged error that is now a unified permissions message within NetworkVariableBase. (#3005)