IIS FTP passive mode not obeying the defined port range issue

After setting the port range for passive mode, IIS keep telling the client to use random ports. The port range setting does not take effect.

Solution:
Open "Services", "restart Microsoft FTP Service".
 http://forums.iis.net/t/1157414.aspx?IIS7+FTP7+Passive+Mode+Problem+Ignoring+Data+Channel+Port+Range+


Other reason:
Some said that windows firewall will modify the passive mode port send by the ftp server. Solution is to use ports other than port 21 or close windows firewall.