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Search max_children erros in PHP Log – error.log grep -r “server reached max_children setting” /var/log/*php*-fpm/error.log | cut -d’ ‘ -f5 | tr -d ‘]’ | sort | uniq -c | sort -nr Plesk check PHP: pm.max_children for varioius websites find /opt/plesk/php/ -type f -name “*.conf” -exec grep –color -Hni “pm.max_children =” {} \; Make cron … Read More “PHP FPM modification – Plesk” »
List of Security HTTP Headers: X-Frame-Options: // Raw header X-Frame-Options: sameorigin // How to send the response header with PHP header(“X-Frame-Options: sameorigin”); // How to send the response header with Apache (.htaccess) Header set X-Frame-Options “sameorigin” // How to send the response header with Express.js app.use(function(req, res, next) { res.header(“X-Frame-Options”, “sameorigin”); next(); }); X-XSS-Protection // … Read More “Security HTTP Headers” »
This information is largely available online; however, I’ve taken the time to compile a list of the common DNS servers here for your own reference. These servers do not belong to internet service providers but other companies ranging from Google, OpenDNS, DNS.Watch and several others. You can use a command such as Dig to query … Read More “Resolving Public DNS Server List” »
See rfc2821 for the basic specification of SMTP; see also rfc1123 for important additional information. See rfc1893 and rfc2034 for information about enhanced status codes. Check the RFC index for further mail-related RFCs. Reply codes in numerical order Code Meaning 200 (nonstandard success response, see rfc876) 211 System status, or system help reply 214 Help … Read More “SMTP reply codes” »
Prefork: The prefork MPM uses multiple child processes with one thread each. Each process handles one connection at a time. On many systems, prefork is comparable in speed to worker, but uses more memory. Prefork’s threadless design has advantages over worker in some situations: it can be used with non-thread-safe third-party modules, and it is … Read More “Apache Prefork versus Worker” »