Hello,
I tried to upload a website today, but there was a socket error message. After 1 hour chatting with the hosting company support, the problem was identified as the firewall. But the firewall was not blocking the port 21, this port was expressly allowed to be open.
Core FTP will not work and I had to disable blocking most of the ports in order to achieve uploading the website. This leaves my computer exposed. Please which ports exactly must be left open for Core FTP to work perfectly? Thanks for your help!