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There was a problem identified where an upstream API connection was found hanging waiting for a TLS handshake to complete. Seeingly the TCP connection was ESTABLISHED locally but not cleanly terminated remotely. The Socket events layer never triggered the TLS handshake oddly. This however enables TCP keep alive packets to detect broken connections, raising EPOLLERR and breaking the deadlock condition so that the agent will attempt to reconnect at a later time. fixes #12003 Signed-off-by: Gunnar Beutner <gunnar.beutner@netways.de>