Maybe one of the setOption flags would help, alternatively try an upgrade to 
version 6.0.
There is also this, which is in theory for version 3.0:
http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q302080&ID=KB;EN-US;Q302080

If all that fails you can normally get better results using WinHTTP instead:
http://msdn2.microsoft.com/en-us/library/aa384273.aspx

-- 

Joe Fawcett (MVP - XML)

http://joe.fawcett.name

<tomkoberle@g...> wrote in message 
news:1175550145.087026.248830@e......
>I have ann application written using VB6 which uese msxml 4's
> ServerXMLHttp control to exchange XML with an application server. The
> architecture is multi tiered in the sense that a first server receives
> the request and acts as a load balancer by redirecting the request to
> a second server which handles the actual request. The URL to the first
> server is http which the redirect is SSL.
> Initially I was getting the following error :
>
> -2147012851 - The certificate authority is invalid or incorrect
>
> I then installed the security certificate onto the client machine and
> that seemed to solve that isseu but another error started coming up:
>
> -2147024891 - Access is denied.
>
> I found a posting on the web suggesting to enable a security option
> related to submitting non encrypted forms but that didn't help.
>
> Has anone ever run into this situation ? Any clues ?
>
> Best Regards
> Thomaz
>