ResolutionCustom permissions on a Plesk domain can be reset by Plesk to default in the following cases:
1. When Plesk reconfigurator is used. It resets all the custom permission to defaults when one of the following conditions are carried out: a) Custom permissions set does not contain default Plesk permissions sub set.
b) Custom permissions are set on top level folder (such as httpdocs, cgi-bin, statistics and etc.)
2. When Microsoft FrontPage support is enabled on a domain. FrontPage can reset permissions in the following cases:
a) When Plesk installs MS FrontPage on domain it calls standard MS FrontPage utility owsadm.exe. This utility resets permissions on all files and folders located in httpdocs .
More information about this tool can be found in the following articles:
b) When "Check server health" is launched on Site Administration page for FrontPage Server Extensions. In this case owsadm.exe also resets permissions.