Unable to connect to Smart FTP

Hello I am not a techie, but I cannot connect to upload to my website using Smart FTP any more. I recently upgraded to the latest version and have had this problem since. I keep getting the following message:
An established connection was aborted by the software in your host machine.
[18:21:47] Connect failed. Waiting to retry (30s)...
[18:21:47] Server closed connection

I use eukhost for my hosting and have tried to sort the problem with them but with no success.

Please post the complete log.

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