This again is invalid, a type assertion to net.TCPConn from a net.Conn object does not allow SetKeepAlive() to be used, it panics.

[andrewhodel]

panic: interface conversion: net.Conn is *tls.Conn, not *net.TCPConn

#51277

[mdlayher]

You've made it clear you have no intention of participating in good faith, and have repeatedly called the integrity of others into question for trying to ask questions to assess the issue you are trying to solve.

Please review https://go.dev/conduct before participating further.