Plesk as a Secondary DNS Server
If you host websites on your account and have a standalone DNS server acting as a primary name server for your sites, you may want to set up the Plesk’s DNS server to function as a secondary name server.
To make the Plesk’s DNS server act as a secondary name server:
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Go to Websites & Domains and click the domain name whose DNS settings you want to manage. 
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Click DNS Settings. 
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Click Primary/Secondary to switch DNS server mode. 
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Click Add Record. 
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Specify the IP address of the primary DNS server. 
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Click OK, and then click Update. 
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Repeat steps from 2 to 6 for each website that needs to have a secondary name server on your server. 
To make the Plesk’s DNS server act as a primary back:
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Go to Websites & Domains and click the domain name whose DNS settings you want to manage. 
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Click DNS Settings. 
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Click Primary/Secondary to switch DNS server mode. The original resource records for the zone will be restored. 
