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To do it server-wide, close the ports used by mail clients on the firewall: Managing Plesk Firewall. Simply change the SMTP, IMAP, and POP3 rules to Deny like in the attached image. Webmail will continue working, while mail clients will time out. You may also want to disable mail auto discover...

It sounds like an issue with the Jio DNS servers. They're known to block many sites, but that'd depend on the content, I suppose. Get the Jio DNS servers. You can start with the ones here: DNS servers in India Then see if they resolve to your Plesk IP addresses: On Windows: nslookup domain.com...

Two weeks is too long for a DNS propagation issue. How do you manage DNS? Is it handled by Plesk or externally, and is it handled the same for all Plesk servers?

How long has this been happening? A day, a week, a month? Do you host all Plesk servers on the same subnet or different ones? Is Plesk the only type of server you host, or do you host any other?

Do you get ERR_CONNECTION_TIMED_OUT, or 502 gateway error, or something else? Send a screenshot

When you say they're not available, what do you mean exactly? What's the exact error they get when trying to access the sites?

Install atop to monitor the system automatically. After the issue happens you can check what was running and the build up to it: How to monitor usage of system resources in a period of time using atop?

It affects all new and existing subscriptions and their domains associated with the service plan. If you add this under Service Plans and hit the Update & Sync button, it will apply the additional PHP directives to all existing subscriptions and sites under that plan, and all new ones will...