Why does SSH authentication through .shosts not work by default in recent versions of FreeBSD?
The reason why .shosts authentication does not work by default in more recent versions of FreeBSD is because ssh(1) is not installed suid root by default. To ``fix'' this, you can do one of the following:
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As a permanent fix, set ENABLE_SUID_SSH to true in /etc/make.conf and rebuild ssh (or run make world).
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As a temporary fix, change the mode on /usr/bin/ssh to 4555 by running chmod 4755 /usr/bin/ssh as root. Then add ENABLE_SUID_SSH= true to /etc/make.conf so the change takes effect the next time make world is run.
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