"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 resolution has completed. It will try to write to the send buffer and send data before the buffer or socket/address has been properly initialized. It doesn't assert when the packet handler is enabled because the SendInitialJoin call is deferred until the handler handshake is complete, and this handshake will retry in the background until the address is resolved and the connection is properly set up.

Reverting to the old resolution behavior with "net.IpConnectionDisableResolution 1" will work around the issue when -NoPacketHander is set.

1. Start a simple multiplayer project like QAGame or ShooterGame in the editor with "-NoPacketHandler" on the command line
2. Start a PIE session with 2 players or a dedicated server

[UE-23848] Bug Status

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