Not Able to Use FTP on Windows2K3 Server

Hi
I am getting error while opening FTP Sites
“Error occure while opening that folder on FTP Server. Make sure you have permissition to access that Folder”
If i use any FTP software to access FTP Sites then following Error generates:
“No connection could be made because the target machine actively refused it”

However i am able to open site using any Win9x/XP with any ie.
Pls help