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Why ExitOnForwardFailure=yes does not prove your database is reachable

An SSH tunnel can be listening on your laptop while the service behind it is unavailable. ExitOnForwardFailure=yes is useful, but it does not turn the SSH process into a database health check.

  • SSH tunnel active doesn't guarantee database reachability
  • ExitOnForwardFailure=yes doesn't check database connection
  • Separate issues: SSH tunnel vs destination database reachability

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