Certificate File (PFX)
Applies to .NET applications.
If you have certificate file to digitally sign your VLF.NET applications, specify its full path and name here, otherwise leave this field blank. The certificate file should contain a PKCS#12 (or Personal Information Exchange) certificate and the file would normally have .pfx extension.
The verify button may be used to confirm that the file specified exists and is accessible.
The verify button does not verify that the file is a valid certificate file.
This property is in the Developer Preferences – Web Server tab.