I cannot log on to WinSCP

I AM NOT ABLE TO LOG IN TO WinSCP
I get the error message
"Network Error:Connection to "sftp.merckedctrials.net" refused
"The server rejected SfTP connection, but it listens to FTP CONNECTIONS
"Do you want FTP connection instead of SFTP? Prefer using encryption.

You are not logging to WinSCP. You are logging to some server using WinSCP.

We do not know your server. you should first contact your server administrator.

See also https://winscp.net/eng/docs/message_connection_refused