Web application tests were not enabled during the scan.
One or several web servers were detected by Nessus, but neither the CGI tests nor the Web Application Tests were enabled. If you want to get a more complete report, you should enable one of these features, or both. Please note that the scan might take significantly longer with these tests, which is why they are disabled by default.
To enable specific CGI tests, go to the 'Preferences' tab, select 'Global variable settings' and set 'Enable CGI scanning'. To generic enable web application tests, go to the 'Preferences' tab, select 'Web Application Tests Settings' and set 'Enable web applications tests'. You may configure other options, for example HTTP credentials in 'Login configurations', or form-based authentication in 'HTTP login page'.