"David Choo" <david@celestix.com> writes:
> Yesterday, when the server was rebooted (power failure), the postmaster
> cannot be started up.
> The log file shows this error message:
> FATAL: 'log_connection' is not a valid option name
Looks like you put an incorrect entry into postgresql.conf. (There is
an option named 'log_connections', but not one named 'log_connection'.)
regards, tom lane