Sometimes I just do "bone-headed" stuff. I had set-up a virtual private server web server with the wrong domain name. Ugggg!
As you can imagine this messed up my FTP and took me a couple of hours to figure out what the heck was going on. I left one letter out of the web domain. So as I looked at my FTP info I was concentrating on my username being wrong or my password. Did look down the line at the domain.
So here is where you go to correct the domain name.
From your server dashboard go into the WHM or WebHost Manager.