An established connection was aborted by the software...

Hello

Just downloaded smartFTP on my PC and I am having problems staying connected to the internet. There is a message saying "an established connection was aborted by the software..." My firewall and antivirus is set up to allow smartFTP to access internet. I have also tried lengthening the time that it has to connect and switching between Active and Passive mode, but this does not solve the problem. Below is the complete log.

[20:12:10] SmartFTP v2.5.1008.16
[20:12:10] Resolving host name "discoverwellness.co.uk"
[20:12:10] Connecting to 84.22.184.20 Port: 21
[20:12:10] Connected to discoverwellness.co.uk.
An established connection was aborted by the software in your host machine.
[20:12:31] Cannot login waiting to retry (30s)...
[20:12:31] Server closed connection

Any ideas or recommendations?