Resolution:
1. Specifying a relative PATH (from the logged user HOME directory)

URL:    ftp:/host:port/dir1/dir2/*
mask:    empty

The resulting command issued by our FTP-MGET will be:
    NLST dir1/dir2/*

Hence files will be retrieved from the &ltftp_user_HOME>/dir1/dir2 directory


2. Specifying an absolute PATH (from the "/" root directory)
URL:    ftp:/host:port//dir1/dir2/*
mask:    empty

The resulting command issued by our FTP-MGET will be:
    NLST /dir1/dir2/*

Hence files will be retrieved from the /dir1/dir2 directory