Parent nameservers not updating
Nameserver records returned by the parent servers are:ns3.p24.
This is a generic error that means something about your request was invalid, independent of the server’s state.This tool is designed to assist webmasters and system administrators diagnose DNS related issues. A number of tests are run on your DNS settings with results displayed in an easy to understand manner. This value basically means 'how long can the secondary nameserver have out of date information after updating the primary nameserver? This value determines how long your nameservers will wait to retry after a failed refresh attempt. You can fix this by adding A records for each of the nameservers listed above. Since the GTLD for your domain (com) differs from that of your nameservers (net), the result of this test are irrelevant since the parent servers aren't even required to hold the A records for your nameservers. Your SOA Refresh value (300) is outside of the recommended range of 1 hour (3600) to 1 day (86400). Your SOA Retry value (150) is outside of the recommended range of 1 hour (3600) to 4 hours (14400).