How to Change the IP for Webmail on Plesk Domain

Symptoms Webmail webmail.example.com shows the blank page or the default plesk page. DNS records for webmail.example.com is managed by external DNS server: # dig +short webmail.example.com @8.8.8.8 203.0.113.2 There is another IP 203.0.113.3 is set in web server configuration file for webmail.example.com: RHEL-like systems grep VirtualHost /etc/httpd/conf/plesk.conf.d/webmails/example.com_webmail.conf | grep -v “/VirtualHost” Debian-like systems grep VirtualHost […]

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DDos Analysis

DDos Detection Articles: https://www.hivelocity.net/kb/how-to-check-if-your-linux-server-is-under-ddos-attack/ http://linuxaria.com/howto/how-to-verify-ddos-attack-with-netstat-command-on-linux-terminal https://support.plesk.com/hc/en-us/articles/360000345633-How-to-diagnose-possible-DoS-or-DDoS-attack-on-Apache

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CORS on Plesk

How to enable and test CORS on Plesk https://stackoverflow.com/questions/12173990/how-can-you-debug-a-cors-request-with-curl https://support.plesk.com/hc/en-us/articles/115001338265-How-to-set-up-CORS-cross-origin-resource-sharing-in-Plesk-for-Linux- and Getting CORS to work with Apache

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