Not sure if this is documented anywhere, my link for 3.5.x is incorrect in the procedure.
To enable SSHd on ESXi 4.0:
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At the console Hit ALT-F1
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type “unsupported” it will not be echoed back to you
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you’ll see a passwd prompt. Enter the root passwd for that ESXi host.
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vi /etc/inetd.conf
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Uncomment the line begining with “ssh tcp”
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ps ax | grep inetd
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kill -1 $PID_from_step_6
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type exit to log out and ALT-F2 to go back to the ESXi admin screen