You'll want to give a few more details.
What Version of VisualCron are you running.
What Operating System is VisualCron running on.
From that same computer/server ^ are you able to use another FTP program and connect without issue?
Is the Connection Protocol just plain FTP?
Your error mentions FTPS, hence my question. I don't have an FTP or FTPS site to test with from where i'm at, but thought i'd ask the questions that might help others.
Brian