FTP connection help!

I keep getting the following error even though the FTP log in details are correct. Any ideas?
Windows 8.1 machine

FTP Thread Started

Unable to connect to ftp.rockislandbar.com.
Authentication failed, sorry

Can you please create us a ftp account on this server and send it to support@webcamxp.com so that we can check if there is something specific related to this server.

I actually had to go into my router and open up port 21 for the application (WebcamXP). Usually, you don’t have to do that, but it fixed it for me.