Symptoms
1. Disable DNS recursion in PleskPlesk , Server, DNS, DNS recursion tab, select Deny , Commit
2. Make sure that this setting is reflected in MS DNS
Start, Run, type dnsmgmt.msc, Right Click on ServerName, Properties, Advanced tab, Disable Recursion check box should be checked
3. Enter DNS settings page on a domain in Plesk
Plesk, Domains, domain.tld, DNS
4. DNS recursion is reset to enabled in MS DNS
Start, Run, type dnsmgmt.msc, Right Click on ServerName, Properties, Advanced tab, Disable Recursion check box is not checked.
Resolution
This problem has been solved in Plesk version 8.1.1. Consider upgrading Plesk to the latest version.