An important point for DNN security after installation:
1.First, you enter your host (Plesk).
2.Enter the dashboard menu from the first menu of the domain and website menu and click on the virtual directories menu.
3.Then you have to enter a directory properties menu, in this menu, disable the checkboxes that you activated from here during the installation phase. These check boxes are according to the following list:
▪Script source access
▪Write permission
▪Directory browsing
▪Allow to use parent paths
▪Allow application execution in
▪Finally, set execute permissions option to Scripts only mode