This doesn't work, I have my admin directory password protected:
/usr/bin/wget -q -O --user myuser --password 'mypassword' http://example.net/admin/cron_currency_rates.php?secure_key=12345 >> /dev/null 2>&1
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This doesn't work:
/usr/bin/wget -q -O --user valerioX --password 'mypassword' http://example.net/admin/cron_currency_rates.php?secure_key=12345 >> /dev/null 2>&1