I have a web service that makes IO calls (file read, write, etc.) to files
on a network server.

Authentication works successfully when the web service is called from the
browser (IE) on the same server that hosts the web service. (ie both IE and
web service are on the same box)

When I call the same web service from a browser on another computer, I get
"access denied" errors when making IO calls.

Settings for IIS:
Anonymous access - unchecked
Integrated Windows authentication - checked

Settings for web.config
<authentication mode="Windows" />
<identity impersonate = "true"/>

I added a webmethod which returns the current user name. Both scenerios
returns my NTLogin name, so it appears my credentials are being passed
through.

Any ideas?

Thanks much!
Steve