Many FTP clients support AUTH (encryption of control channel) but do not support PROT (encryption of the data channel) - we require that FTP clients support both to ensure all data is transferred securely over TLS. If you are able to login but are unable to open a data connection and receive an error message similar to "Unable to open data connection" then lack of support for PROT in your FTP client is likely the cause.
Resolving "Unable to open data connection" Print
Modified on: Wed, 7 Oct, 2015 at 11:37 AM
Did you find it helpful?Send feedback
Sorry we couldn't be helpful. Help us improve this article with your feedback.