Unable to switch the DNS server to Simple DNS Plus Error: Some fields are empty or contain an improper value

Symptoms

• Unable to switch DNS Server to Simple DNS in Plesk > Tools & Settings > Server Components > Simple DNS Plus. The following error occurs upon clicking OK:

  PLESK_ERROR: Error: Some fields are empty or contain an improper value

• Version of Plesk is Onyx 17.5 and higher.

Cause

Misconfiguration of Simple DNS component.

Resolution

It is required to reset the settings for Simple DNS. For that:

1. Connect to the server via RDP;
2. Go to Start > Search for "Simple DNS Plus", and open its management console;
3. Go to Options > General > HTTP API;
4. Unselect the Enable HTTP API option to disable it and click OK;
5. Select the Enable HTTP API option back and click OK;
6. Log into Plesk;
7. Go to Tools & Settings > Server Components > Simple DNS Plus;
   • In case the Authentication method in Simple DNS > Options > General > HTTP API is set to "None (anonymous)", then, in Plesk, leave the "Connection password" field blank;
   • In case the Authentication is set to Basic, insert the corresponding password in the "Connection password" field;
8. Click OK;

Additional Information

• Unable to switch the DNS server to Simple DNS plus because of missing license.xml file
• Does Plesk Onyx support Simple DNS plus 8?