HELP: cannot log in to server

When I try to connect to any server I am getting this:

[14:53:49] SmartFTP v3.0.1022.15
[14:53:50] Resolving host name ""
[14:53:50] Connecting to Port: 21
[14:53:51] Ein ung├╝ltiges Argument wurde angegeben.
[14:53:51] Client closed the connection.
[14:53:51] Connect failed. Waiting to retry (30s)...

I have used SmartFTP as demo version before and it always worked.
Now as I have decided to license it properly, it doesn't anymore...

Add SmartFTP to the exceptions in your software firewall and antivirus product.


thanks, Mat, that helped