Hi,

I'm am developing an application to use windows authentication.

In IIS anonymous access is turned off

In my web.config file I have:
<authentication mode="Windows" />
and
<authorization><allow users="*" /></authorization>

This works fine in the development environment, but when I deploy,
some of the users get a windows login popup. Entering their user name
& password works, but sometimes they need to fill it in several times
during a page load!

Clicking cancel seems to be acceptable, and the pages load after one
or more popups are dismissed.

This does not occur on all client machines, it does not occur
consistently on the same pages either - it all seems quite random!

One user claims that he eventually had his NT account locked out after
canceling too many times (I still need to verify this).

I assume that the problem must be client-side, as it doesn't happen on
every machine. Clients are using IE 6 browsers. Authentication is set
to 'automatic logon only in intranet zone'.

Any ideas what could be causing this?

Thanks,
Toby :)