Handle closed client connection after registration #16407
Merged
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It could happen that this connection is already closed and onConnectionClose()
is called even before the authentication handling logic is executed. In this
case, now we have a closed but registered connection in the client connection
manager. We do a final check to remove this connection if needed.
This check was already here before and removed with 3d897c2 because of wrong
reasoning.
Fixes #16288