NETL-220 — The proxy sends TCP reset instead of normal TCP connection close
When the proxy closes a TCP connection, it uses standard TCP closing sequence, or TCP reset. This warning is logged whenever reset is done, because it is a nonstandard termination of a connection. Performing TCP reset has two purposes: it informs the peer that the session has not terminated cleanly, and it prevents sockets stuck in FIN_WAIT_2 state. Depending on situation, TCP reset may be harmless, or it may signal some problem.