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WMO LC DNV FTP site is hosted by ECMWF. It is a password protected and can accessed at ftpaux.ecmwf.int using the login name "wmolcdnv", URL ftp://wmolcdnv@ftpwmolcdnv@aux.ecmwf.int/. Server also supports the sftp protocol.
Please note the FTP server does not provide access to ECMWF forecasts. It serves only for exchange of verification scores.
If you intend to provide verification scores of your model please contact ECMWF WMO LC DNV group to obtain the password for login.