Old, cold thread, but the problem is that the link needs to be http, not https. You can work around it in Firefox by right-clicking the lock icon at the start of the address bar and selecting to make a temporary exception for the insecure content.

Thanks, Steve. Believe it or not, upgrading to 9.02.157 using the above file resolved the problem. The connection succeeds with just FTP alias name. The error message does not appear. Much obliged.

Actually, the message does not come from the server; it appears immediately, before any data is sent over the Internet and does so even if the computer is uplugged from the network. And since iftp mydomain works, but iftp myalias doesn't, and the FTP.CFG file is correct, it must be something in...

I'm using TCC 9.00.99. According to the help, I'm supposed to be able to set an alias name in parentheses (myalias) in the ftp.cfg file so that I can connect to an FTP site with a convenient shortened form, like this: iftp "ftp://myalias" The line in ftp.cfg would be ftp://mydomain.com...