FYI: found the answer in this NG:

>>Check this KB article on serverXmlhttp security.
>>
>> http://support.microsoft.com/?id=820882#6

Thanks Han!
Stefan

"Stefan Misch" <stefan.misch@r...> schrieb im Newsbeitrag 
news:e$fkCcK2EHA.1396@t......
> Hi NG,
>
> last week everything worked fine with on my german WinXP-SP2 (all latest 
> security updates via SUS). Now I get an "Access denied" error on Send( ) 
> with MSXML2.SeverXMLHTTP.4.0-object. I need to POST some XML data to 
> another server (AXIS web service) via HTTPS. I provide username and 
> password via Open( ). A sample HTML page using the XMLHTTP-object with 
> javascript works on this machine. There is no proxy involved (proxycfg 
> returns "direct access"). In my application (4GL-language, uses 
> ActiveX-objects a bit like VB6.0) I have to use ServerXMLHTTP because I 
> need to set timeout parameters.
> So what may have changed? What else can I check? I already re-installed 
> MSXML4-SP2. I also tried to pass base64-encoded credentials via 
> setRequestHeader("Authorization", "basic ...").  But I still get "access 
> denied".
>
> TIA,
> Stefan
>