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?