IIS download resume?

I've got 2 problems.

How do I allow people to be able to resume downloads and have more then one connection with a download manager? Right now it will not resume and will not allow more then one connection.
I'm using windows server 2003 and IIS 6.0

And does anyone know why I'm getting speeds of 200~300KBps from my FTP server and only speeds of ~50KBps my site?
I'm using Cerberus as my FTP server and the integrated web server with IIS.

Thank you.

 

 

 

 

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