how to connect dos network with win 2003

I have Norton Ghost Enterprice edition 7.5 Running under
win 2003. My problem is when trying to load or dump an
image file to or from my server, the client could not
communicate with the server.
It is giving an error called error no. 506.

Someone told me it is difficult letting a client operating
in dos mode, communicate via networking as there might be
a security issue.

Could anyone give me some guidelines how to solve this
problem??

Thanks in advance.