'allowedip' is configured and works properly when accessing the site through a web browser.

'cronclionly' is enabled.

When the cron.php script is executed (from crontab using the php binary) nothing is processed and the following message is instead printed: "This site is not available currently."

The function remoteip_in_list() in moodlelib.php doesn't seem like it will ever return true if cron.php has been run through the CLI.