Can't get queued component from SOAP

[CraigB]

I'm getting a permission denied error when I try to get a queued
component using the GetObject(moniker) from a component instantiated by
a SOAP call. I know my component is being created from the SOAP call
but it fails on GetObject(queue).

The process path is SOAP -> Component -> COM+ queued component

The strange thing is if I use ASP instead of SOAP to call the 1st
component then it works but a SOAP call doesn't. The caller identity is
the same in both cases so I don't understand why there's a permissions
problem in one instance and not with the other.

System details: The components are written in VB6 deployed on XP and
using the SOAP 3.0 ISAPI mapping to call the component. Everything's
currently running on the same computer too.

TIA

Craig