I have searched your database and found this issue across many different categories and operating systems but with either no solutions. I am runing Win2K3 and IIS FTP. I have a DLINK DI-624M Router. I have tried the WS-FTP client, command line FTP, and IE 6.0 but all give the same response. I can connect via user/pwd to the FTP site using the internal IP or internal machine name of the FTP server, but not via the external IP or DNS. I have tried Passive mode on WS-FTP client. I have opened up Ports 20, 21, and even ranges 3800-3900 to allow the passive data response in the DLINK router but nothing seems to work. I have even enabled the server to be on the DMZ vai the DLINK router but it still doesn't work. My FTP site is completely unaccessible now from the outside. It seems to be a router / firewall issue but I do not know how to resolve it. Your expert assistance is needed.