#LogHandshake: Server is running an incompatible version of the game IrisReplication vs Generic

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dense flicker
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Iris Replication is a new Experimental feature not yet enabled by default and not even mentioned in the original post I reference here. These log statements show Iris disabled.

LogCsvProfiler: Display: Metadata set : iris="0"
LogConfig: CVar [[bUseIris:0]] deferred - dummy variable created
LogConfig: CVar [[bUseIris:0]] deferred - dummy variable created
LogIris: FNetObjectFactoryRegistry::UnregisterFactory is unregistering factory: None name: NetActorFactory id: 0
LogIris: FNetObjectFactoryRegistry::UnregisterFactory is unregistering factory: None name: NetSubObjectFactory id: 1

However,

LogHandshake: Server is running an incompatible version of the game, and has rejected the connection. Server version '2693992874', Local version '580620740', Server features 'IrisReplication', Local features 'GenericReplication'.

I explicitly disable Iris in the .ini file to be safe but both machines when trying to join the other session report server features 'IrisReplication'

A possible fix is to override version checking manually as mentioned in this thread https://forums.unrealengine.com/t/how-to-override-dedicated-server-version-checking-connecting-clients/1927782 but I have not attempted this yet

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Hello, I have a dedicated server project using UE 5.1 built from source. I set my project version to 1.0 and I build my dedicated server, then I build a client and everything works fine. However I also have an automated build process set up that increments my project version with every build, so for example I can have a client build versioned 1...

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https://forums.unrealengine.com/t/client-connection-with-invalid-version/402965

Here is a reported solution in the case of dedicated servers by using networkversionoverride command line argument

Epic Developer Community Forums
Client connection with invalid version

Hi, I’m having a lot of trouble getting a connection between my Linux machine which acts as a Unreal Server and my Windows machine which is the client. For testing I’m using the default Third Person Template with working multiplayer on a single machine. Error: LogNet: NotifyControlMessage: Client connecting with invalid version. LocalNetwo...

slow tree
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btw, I somehow got this issue fixed. I don't remember how exactly