Reset Account permissions and security settings in SharePoint 2013

This cmdlet enforces security for all resources, including files, folders, and registry keys.

If your security settings on the file system or in the registry are mixed up, you could use this cmdlet to reset those permissions.

This could solve issues like The Managed Metadata Service or Connection is currently not available
“The Managed Metadata Service or Connection is currently not available. The Application Pool or Managed Metadata Web Service may not have been started. Please Contact your Administrator.”

Here’s the link to the Technet Article.

“The Initialize-SPResourceSecurity cmdlet enforces resource security on the local server.”

The Account permissions and security settings in SharePoint 2013 can be found here.