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systemdsystem. If one usesRestart=on-failurethen manually killing the SSH client will not result in a restart-by-systemd as the SSH client with exit with success.ExecStartfor example to build thesshargument list, do basic checks etc then call it from the script like soexec /bin/ssh -N .... Here is my command:exec /bin/ssh -N -oExitOnForwardFailure=Yes -oTCPKeepAlive=no -oServerAliveInterval=5 -oServerAliveCountMax=6 -i "${LOCAL_PRIVATE_KEY}" -L "${TUNNEL_INLET}:${TUNNEL_OUTLET}" "${REMOTE_USER}@${REMOTE_MACHINE}"whereTUNNEL_INLET="127.0.0.1:3307"andTUNNEL_OUTLET="127.0.0.1:3306"StartLimitIntervalSec=0to the[Unit]section. This disables the rate-limiting feature of systemd, which prevents restarting services if they fail too fast. This could happen if the local network device is temporarily down, and ssh would quit immediately with a connection refused error.channel 0: open failed: connect failed: Connection refused stdio forwarding failed kex_exchange_identification: Connection closed by remote host Connection closed by UNKNOWN port 65535but 65535 was not mentioned in my command. My tunnel works fine if I set it up myself.