IE8 displays page cannot be displayed...

I am writing a WEB Service that is using Negotiate protocol with the MS api
AcceptSecurityContext. If the browser is not logged into the domain but a
group and tries to access the service the browser will respond with a
WWW-Negotiate header passing a token to the service. However the browser will
return a Page Cannot be displayed if the output of the AcceptSecurityContext
returned a SEC_I_CONTINUE_NEEDED and the output buffer is sent back. I would
have expected the browser to prompt for credentials or make a new request and
choose another option when the cycle repeats. If this is the desired
operation of the browser should I not return the output from the
SEC_I_CONTINUE_NEEDED and resend the 401 without the Negotiate as an option ?
By the way if I do a good NTLM the kerboros will succeed when tried again.

Just looking for the correct approach.

Thanks,
--
Timothy Jewett

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Timothy Jewett wrote:
> I am writing a WEB Service that is using Negotiate protocol with the MS
> api
> AcceptSecurityContext. If the browser is not logged into the domain but a
> group and tries to access the service the browser will respond with a
> WWW-Negotiate header passing a token to the service. However the browser
> will return a Page Cannot be displayed if the output of the
> AcceptSecurityContext returned a SEC_I_CONTINUE_NEEDED and the output
> buffer is sent back. I would have expected the browser to prompt for
> credentials or make a new request and choose another option when the cycle
> repeats. If this is the desired operation of the browser should I not
> return the output from the SEC_I_CONTINUE_NEEDED and resend the 401
> without
> the Negotiate as an option ? By the way if I do a good NTLM the kerboros
> will succeed when tried again.
>
> Just looking for the correct approach.
>
> Thanks,