So we dropped litespeed trial in to test out its performance on one of our production servers to replace our Apache 2.2 suPHP install. Once activated we started receiving support requests all over from our clients. Websites everywhere were displaying forbidden errors. I deferred to the error logs and couldn't find squat regarding what was causing the errors but the usual missing 40x.shtml file entries. We tried switching back to Apache and received this over and over: LiteSpeed Web Server Control Operation ... Switch to Apache Stopped LSWS Apache is not up within 30 secs, please try again LiteSpeed is still running! Failed to switch to Apache. Please try again! Starting apache manually resulted in listener port missing. Viewing its httpd.conf sure enough it was missing that and a slew of modules. Ultimately to get our clients back up we had to force an easyapache rebuild. So much for a drop in replacement. Not a great first experience with LiteSpeed. Besides htaccess rewrites, what are the common cause for all of this madness?