Enable Clear Command Channel for FTPS

We are using FTPS feature in WM IS 6.5 to ftp files securely to a vendor. For this Vendor has requirement that CCC needs to be enalbed. I could not find this any where in built in FTP service. The only option in secure data paramter are Prot P and Proc C. How to enable Clear command channel in webmethods IS 6.5 ftps service?

Any inputs will be greatly appreciated.