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please refer https://www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:other-ext-apps:servlet-engine-setup see if it works for your case.

yes. looks same test result as mine this 2 looks most useful ones than others(within mod_headers)

great. so your lsphp5 are running as a single user(say nobody)? can determine this by #ps -ef|grep lsphp5 in non-suEXEC mode, opcode cache(xcache etc)will work well since the cache is kept in memory as long as the parent lsphp5 is running.

I'd suggest to comment out extension="xcache.so" extension=pdo_sqlite.so extension="memcache.so" if possible. see if any difference on performance and stability(number of 503 errors in error log) if you run php in normal suEXEC mode(suEXEC Worker), no much benefit to enable opcode cache...

have you installed ClouldLinux ? 2-3 days ago I experienced 503 errors on a user's server, some domains(wordpress) can't work at all while some others works. Server->General->Cloud Linux: Not Set when I changed it to "Disabled", the 503 errors gone. also I removed a few php...

good research work done, thanks. will benefit for other users who search to here. lsws may improve Header RequestHeader (http://httpd.apache.org/docs/2.2/mod/mod_headers.html) function in future release.

does this 503 error happen on a particular domain only(or not)? does it have any relation to "HEAD" request ?

can you give a example how to add headers to ColdFusion in apache ? so make the issue more clear.

set these headers in php script: http://www.php.net/manual/en/function.header.php this should be same behavior under apache.

have you done "build matching php for litespeed" i.e. lsphp5? if done, how did you build it ?

this looks correct. can you put phpinfo.php somewhere and check the value of session.save-path ? the document: php.net/manual/en/session.configuration.php#ini.session.save-path

check if /usr/local/apache/bin/httpd_ls_bak exists if exist, #mv /usr/local/apache/bin/httpd_ls_bak /usr/local/apache/bin/httpd see if back to normal

what's the setting of lsws web admin->Server->General->PHP suEXEC ?

for php 5.4.x and 5.5.x, please try Zend OPCache: http://php.net/manual/en/opcache.installation.php

should be permission problem. check which user litespeed process is running as: #ps -ef|grep litespeed default is nobody if nobody user has no permission to access /home/{my_usernames_here}/html/, will return 404 Not Found.

I thought it can be set via lsws web admin->Server->Tuning Max Keep-Alive Requests Keep-Alive Timeout (secs) after testing, it looks like Keep-Alive:timeout=5, max=100 no change

can reproduce same error on our lab's WHM/cPanel. tried to trace it, but no result yet ... will inform our staff to look into it

>Some multiple domain registrations are failing silently, without anything being logged anywhere. then how do you know the failures, are there any entries in access log ?

this may help: lsws web admin -> Actions -> Toggle Debug Logging

when the process take up 99% CPU, you can strace it #strace -p pid-of-the-process for a while, to know about what it's doing. paste the output here if not long.