550 Access denied

After Installing Microsoft ISA2004 server , clients accessing FTP server gets error "550 Access denied".

This indicates that FTP folders & files have read only access.

Time being I bypassed ISA server as temporary measure.However what is the correct solution.

I solved the issue my self.

Microsoft ISA server (acts as Firewall) has default setting of allowing FTP clients to access FTP server to download only.

To change this settings
Open ISA management ->select Firewall policy ->Web Access ->Protocol
->Filtering ->Configure FTP

On this page remove check mark from "Read Only"

And this solves the problem.

Thank you for your contribution. I hope it helps other FTP users.

Regards,
-Mat