I had a client contact me saying that after restarting his CentOS+Plesk box, all domains were showing the default CentOS Apache page.
showed no domains, and a quick glance at
revealed that it was a bone stock CentOS config file. All data was still there, and the sites were listed in Plesk, but the configuration files were non-existent. Luckily, the following websrvmng command saved the day: