I recently switched to a different VPN provider, therefore did a fresh server installation. Before I proceed, please keep in mind that I am not super experienced with server stuff.
I am having a problem with my FTP server installation. Even though I think this is not relevant with what FTP server I am using (because I had the same error on both Windows Server FTP Services and FileZilla), I am currently using Windows Server FTP. I was getting "Failed to retrieve directory listing" message. In my research, I have found this has to do with the port opening.
Anyway, I got it working by changing some settings in the port that I have opened (21) but my real question is;
The previous (not working) FTP port rule was Protocol Type: TCP. Now that I have set it to Protocol Type: Any it works perfectly. But I am not sure if that would cause a security issue... I have tried each option in the combo box but none of them even let me connect... But when I select the Any option, it works. So, the question is; is it safe to use Any option for the protocol type?
Thank you!