If you want to use SSL when using 4th Dimension or 4D Server as a Web server, you put the key.pem and cert.pem files in your database folder, which is on the same level as your structure file or merged application. And if you’re using 4D Client as Web server, you put the two files in the 4D Client application folder. In Windows, this location is on the same level as the 4D Client application. On the Mac, the two files must be placed inside the 4D Client application package at the same level as the "contents" folder.