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1. install opcode cache if not. for php 5.4.x, try OPcache (http://php.net/opcache) 2.for lsphp5 settings, try to reduce Max Connections=500 PHP_LSAPI_CHILDREN=500 to 150 or 100 or 50 ?

if you use apache configuration file, then it's same way for apache + mod_security, put the rules in a file and include from apache's httpd.conf if not use apache's httpd.conf, then lsws web admin -> Server -> Request Filter -> Request Filtering Rule Set: Add

recompile lsphp5 to include APC or XCache module. APC is part of php not part of apache. litespeed only replace apache.

does the script work under apache ? can you give an example URL and a simple example source code of CGI script ?

Thanks for the update, I forgot about the log rotation by cPanel... for your reference, I recalled some users use "piped log" in WHM/cPanel to avoid log rotation.

please refer http://www.litespeedtech.com/support/forum/threads/modsecurity-rules-to-protect-wp-login.6835/

I think you're using the standard version http://www.litespeedtech.com/products/litespeed-web-server/editions Comparison of LiteSpeed Web Server Editions

and these: 1. /var/spool/cron 2. /etc/crontab

can you give a screenshot of lsws web admin -> Actions -> Real-Time Stats, so I can better understand your issue

please check your cron jobs, if there is one to restart web server. can determine by check the time stamp of restarting, if it's almost in fixed time. also check /usr/local/lsws/logs/lsrestart.log, see if any clue from it. because file /usr/local/lsws/fcgi-bin/lsphp55 not exist, can be...

maybe no problem for the setting. this may be normal. assume there are 20 CDN front servers, for a single static file for example common.css, echo CDN server need fetch common.css from original server. but just for 1st time. once the common.css already on CDN server, it'll serve common.css...

those log are INFO level. can be ignored.

just add a symbol link in /usr/local/lsws/fcgi-bin/ #ln -s lsphp-5.5.8 lsphp55

#yum install libpng-devel please refer this wiki page: https://www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:php:lsapi-troubleshooting

please check error_log right before lsws stopped. when lsws start or restart, it'll leave a log message like "...[NOTICE] Free software update of your owned license will expire in..." check the time stamp of error logs around above log entry.

if it's WHM/cPanel, please go WHM->Litespeed Plugin to switch between apache and litespeed is the 404 error fixed ?

check of /dev/shm is full create a cronjob to clean up old files on /dev/shm to ensure it's not full also run df -hi to see if inode is full

Sorry, I mean the "Detailed Log" in your first post, and the info already there please do: #yum install patch here's a wiki page for reference https://www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:php:lsapi-troubleshooting

Please scroll down "Detailed Log", paste the last few lines, it contains the detail error logs there.

Basically it is right. yes, there are 2 types vhosts: 1 type is from apache's httpd.conf(let's refer it as apache vhost), another is "native vhost" which is defined in lsws web admin->Configuration->Virtual Hosts which is stored in a .xml file (for example...