Can anyone help me to find out about that ??
I just used ActiveX DLL created from VB6 in VB.Net (ASP.Net).
I got an error ==> "QueryInterface for interface MyDLL.myFunction failed" when I use with Server2003 and IIS6 , but all my code works fine with WinXP Pre and IIS5.
My ActiveX DLL is about CryptoAPI function.
Where can I get information or solution?

Thank in advance.

Hi,

This could be a security issue

The ASPNET account needs to have
sufficient permission to execute the DLL and any other DLLs that it
requires. If it has permissions, then try the following steps:

1. Check whether legacy COM Component References ASP.tlb and tries to use
Response/Request objects.
In this case set the <%@Page AspCompat="true"%> Attribute in the ASP.NET
WebForm

2. Check whether WebService or WebForm calls remote COM+ Component.
Auditing Logon/Logoff Failures will show ASPNET failing to logon to the
Remote COM+ Server. In this case set the following Tag in Web.Config file

<identity impersonate="true" userName="uid" password="pwd"/>

NOTE, if using Integrated security just setting Impersonate to true should
workfine. If using Anonymous, then can change the Anonymous user in IIS to
a domain account, and only set impersonate="true". This may be needed if
you do not want to specify a user and password in the web.config file.

Let me know if this helps!

Cheers,
Monica

Thanks a lot Monica.

It works... so my job can go on. :)