Need to configure WS-FTP server.

I don't think that your Virtual Server should have a SFTP profile. I'm not familiar with recent versions of WS_FTP server but I'm going to guess and say that it supports FTP, SFTP and HTTP/HTTPS or something like that, and it's up to you to open whatever protocols and ports that you wish to use. In this case it looks like you are trying to open the HTTP/HTTPS interface. So your setup is fine (VS listening in HTTPS on port 443, server is listening on port 80 with no encryption) but you need to remove the SFTP profile. Your VS should have a HTTP profile as well as a client SSL profile. Can you try that?