Note: Updates will be posted to the top of this page, with the previous messages further down…
The server provider resolved the Plesk license issue on the afternoon of 12/24/2018. The Plesk Control Panel is available, again.
[Update 12:00am 12/8/2018]
The server provider has resolved the mySQL database issues. Websites that use a mySQL database are, again, working properly. There remains a Plesk Control Panel license issue which prevents logging into the Plesk Control Panel to make changes. We have a trouble ticket open for this issue and are waiting for a resolution. With the exception of the license issues, it appears all services on the Plesk6 hosting server are back up and running.