Received same error after upgrade to 3.2.4. Even older version 3.2.3 and 3.2.2 produce same server connect http response header. Tried disabling all plugins, cancel cron job, and still not working. Happens on several wp sites with different hosts.
Backwpup runs wp-cron test and http request fails.
CALL STACK RESULTS:
WP_Http->head()
wp-includes/class-http.php:448
wp_remote_head()
wp-includes/http.php:204
BackWPup_Job::get_jobrun_url()
wp-content/plugins/backwpup/inc/class-job.php:552
BackWPup_Page_Jobs::load()
wp-content/plugins/backwpup/inc/class-page-jobs.php:439
do_action(‘load-backwpup_page_backwpupjobs’)
wp-includes/plugin.php:525