Everything was working fine untill...

It's been a few weeks since I used SmartFTP (It used to work perfectly), now:
" SmartFTP v1.5.988.47
Resolving host name "thesparky.myftp.org"
Connecting to 12.222.128.227 Port: 21
No connection could be made because the target machine actively refused it.
Client closed the connection.
Active Help: https://www.smartftp.com/support/kb/58
Cannot login waiting to retry (30s)...
"
I get this with any server I try to connect to all of a sudden..
I have a router, but I haven't changed it's settings in forever, so I doubt it has anything to do with the firmware. Also, I don't have any other firewall.
Any suggestions?
Thanks.

Try to increase the timeout value to e.g. 60s. Have you flashed a new firmware on your router recently?