You can either add an existing key – that you might have created using tools like PuTTYgen, in which case we recommend using Ed25519 from the EdDSA family of algorithms as it offers both a good level of security as well as good performance – or let FileZilla Pro Enterprise Server generates one or more for you.
To create or add a host key go to Protocol settings › SFTP (SSH) and click on the Add button. To upload a private host key you need it in PEM (Privacy-Enhanced Mail) format. The SFTP Server configuration panel contains two tabs: Connection Security tab, where you can upload the host key or let the server generate one for you the Welcome message tab, that allows you to set up the welcome message.
