POST fails when sends authorization header

[Alfons Puig]

We have an application that runs on a virtual directory with anonymous
authentication; one page POSTs data from vbscript using
CreateObject("InternetExplorer.Application") and the navigate method. It
works fine.

But when the application is executed from a parent application that runs
with windows integrated authentication, then the POST fails (content length
= 0).

I have enable tracing and when POST fails there is a header Authorization:
containing NTLM XXXXXXXX.

Remarks: I can't change the authentication method for both applications.

Thanks,

Alfons