Use the ICIClientSettings interface SetClearFTP method to allow a user to connect using unsecure FTP. Use the same method to prohibit the user from making unsecure FTP connections. Refer to User Connection Protocols for an illustration of how this and other Client Settings Interface Methods and Properties can be accessed in the Administrator interface.
Signature:
HRESULT SetClearFTP([in] SFTPAdvBool val);
0 = Prohibit
1 = Allow
-2 = Inherit