* ssh(1): refuse attempts to set ConnectionAttempts=0, which does not make sense and would cause ssh to print an uninitialised stack variable. bz#2500
When using connection multiplexing, I sometimes set ConnectionAttempts to 0 in order to avoid opening a new connection when the remote side refuses to create new sessions after the top defined by MaxSessions is reached.
Having a way to avoid that fall-back behavior is important when writing automation scripts. Otherwise, authentication prompts may appear at any time, and scripts would have to cope with it.
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