I'm working on a client's fresh install and server. Every time I attempt to save a post or page, I'm immediately sent a connection reset error (
This webpage is not available - ERR_CONNECTION_RESET).
admin-ajax.php is also triggering a connection reset when autosaving drafts.
This install is unremarkable (WP 4.2.2, 2015 Theme, no plugins active) and is on a very capable machine: 2 CPU / 32 gb ram.
The only thing that is out of the ordinary is that it is behind a SSL load balancer that isn't reporting SSL to Apache. I added
$_SERVER['HTTPS']='on' to wp-config.php manually to avoid mixed content errors when serving JS/CSS resources.
I've checked the logs and tried a number of things but I'm at my wit's end.