503 error on websites when LiteSpeed used

Issue symptoms

Sometimes PHP websites are showing 503 error page when LiteSpeed is used, however, users are not reaching LVE EP limits.


The issue may be caused by CSF/LFD killing PHP processes. If you have it installed, then check the log:


To resolve the issue for good, the /etc/csf/csf.pignore file should be modified – add the processes to be ignored:

And restart LFD service:

More information in official CSF documentation, Chapter 8 of https://download.configserver.com/csf/readme.txt

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