Unreal Engine Issues

"Assertion failed: NumberOfFreeBits >= 0" on clients that attempt to connect to a server with the -NoPacketHandler option

With the rework of IP address resolution in 4.25, this assert now occurs. When no packet handler is used, UPendingNetGame::InitNetDriver calls SendInitialJoin() immediately, before async address res ...

Available network bandwidth is too low for uncapped but slow frame rates

The networking system has a max frame rate of 120hz by default. Inside UNetConnection::Tick it computes an estimated bandwidth by using that max frame rate, the engine's max frame rate, and the actu ...

Standalone network profiler UI is cut off and unuseable at default DPI scale

The network profiler C# exectuable that shipped in 4.25 is not fully useable on either my development machine or my home machine, because part of the UI is cut off below the window no matter how I r ...

Network profiler crash

Running with the -networkprofiler command line argument can crash the server on the first engine tick in FNetworkProfiler::TrackFrameBegin because the file writer archive hasn't been created yet. ...

PIE: Incorrect NetMode when OnPostWorldInitialized is called

Replication issues & warnings if a client hitches while the server seamless travels

If a client hitches while a server performs a seamless travel, the client will get multiple lines of logspam of these warnings:Warning: UActorChannel::ProcessBunch: SerializeNewActor failed to find/ ...

Replication issue with actors not being attached to sockets

If the client received AttachSocketName before AttachParent, USceneComponent::AttachToComponent will be called while AttachParent may be null, resulting in the received socket name being lost. When ...

ShooterGame clients can fail to connect to a server under packet loss when network encryption is enabled

ShooterGame demonstrates the issue where when encryption is enabled, if the (unencrypted) EncryptionAck message is dropped, the resent messages will be encrypted since the server has enabled encrypt ...

Fix function forwarding in demo drivers in instant replays

Demo drivers that are actively playing back a replay while still connected to another server as a client (via game net driver) will generate warnings due to the function forwarding code (UNetDriver: ...

FUniqueNetIdRepl::NetSerialize() crashes when embedded in a TArray() of structs.

Calling the NetSerialize() function of FUniqueNetIdRepl from a custom NetSerialize() causes a crash. This only seems to occur when the struct is part of an array RPC parameter. ...