WordPress database error: [Table 'wp_options' is read only]
UPDATE `wp_options` SET `option_value` = '1472504865' WHERE `option_name` = '_transient_doing_cron'

Warning: fopen(http://springschool2012.sampl-lab.org/wp-cron.php?doing_wp_cron=1472504865): failed to open stream: HTTP request failed! in /var/www/sss2012bis/wordpress/wp-includes/class-http.php on line 877