Computer account "unknown username or password"

Hi all,

IIS6.0
Windows 2003 SP1
two computers no domain.

I have an issue with connecting to a UNC virtual directory. I have a
webserver, this server needs a virtual directory to upload content in to a
UNC path for storage purposes.

These are two systems without domain only local users. When I upload via the
virtual directory. I can see in the security event viewer of the storgae
server, that this is not allowed because of an unknown username and password
for the computeraccount. This behaciour is by design of course because the
computeraccount is not known to the remote server.

So I trieded to set the anonymous option but still the server is
authenticating himself

Is there a way to let the webserver authenticate itself as a normal user
which is
present on both systems, instead of using his computername?

Help would be appreciated!

Thanks Remco