When you run the User Manager, the browser connects to the Reflection for Secure IT User Manager application server. When you run the Transfer Client, the browser connects to the Reflection for Secure IT Web Transfer Server. In both cases, the connection is made using HTTPS.
Why you see certificate warning messages
When an HTTPS connection is established, the browser requests that the server identify itself. By default, the Web Edition servers send a self-signed security certificate to the browser for this purpose. (A self-signed certificate is signed by the same entity that it certifies.) The browser checks the digital signature in this certificate against its list of trusted Certificate Authorities (CAs). You see a certificate warning because the signer of the certificate is not in your browser's list of trusted CAs.
Depending on where you are in your Web Edition evaluation and configuration process, you may use any or all of the following to manage server certificates.