RPC calls fail with error 5 (access denied) when executed by COM objects within an ASP application

I have an ASP (not ASP.NET) application running under IIS Server version 6.

The web site is configured to run under integrated windows authentication.

The code within one of the COM components instantiated in the VB script on the ASP page executes the RPC call to a third party server application running on another Windows 2003 server machine. The RPC call fails with the error 5 (Access Denied). The same error occurs regardless of the user of the web site. It fails with the same error even when the web site user is the local admin on the web application host.

The RPC call succeeds when executed from VB script running under Microsoft scripting engine on the web application host.

It looks like the problem is related to the security settings of the IIS/ASP server.

Is there a way to fix this problem by changing the configuration of the IIS/Web and/or some other security related configuration on the host machine?

Thanks,

Andrej