You can disable SSL support for every user on EFT by disabling SSL support on the Site or you can disable SSL for a specific user or Settings Template. (See also Configuring SSL on the Server.)
To disable SSL connections
In the administration interface, connect to EFT and click the Server tab.
On the Server tab, click the Site, Settings Template, or user for which you want to disable SSL
In the right pane, click the Connections tab.
Clear the FTPS (SSL/TLS) - Explicit mode, FTPS (SSL/TLS) - Implicit mode, and HTTPS check boxes. At least one of the non-SSL protocol check boxes (FTP, SFTP, HTTP, AS2) must be selected or inheriting the parent settings.
Click Apply to save the changes on EFT.
If SSL connections are disabled on the Site, they are also disabled for all Settings Templates and users on the Site.