"Access Denied" to ICatalogCollect ion from asp.net web service

[Ollie]

I am trying to access the transients subscriptions for a remote COM+ server
from an asp.net web service, the problem is access rights to save to the
local transient subscriptions, the code fails when I attempt to call
'SaveChanges' a System.Unauthor izedAccessExcep tion is generated.

So what access rights to I have give to the asp.net process for it to work
or do I have to use impersonation to setup the subscription?

The code is written in C# and OS is Windows 2003 + IIS 6., the code is shown
below....

Cheers in advance
Ollie

static public void Add(string subName,Type eventClass,Type
sinkInterface,s tring method,object subscriber)
{
Type sinkType = subscriber.GetT ype();

//Verify the interface has that method
if(method != "")
{
MethodInfo info = sinkInterface.G etMethod(method );
if(info == null)
return;
}

//Adding a new transient subscription to the catalog
ICOMAdminCatalo g catalog;
ICatalogCollect ion transientCollec tion;
ICatalogObject subscription = null;

catalog = (ICOMAdminCatal og)new COMAdminCatalog ();
transientCollec tion =
(ICatalogCollec tion)catalog.Ge tCollection("Tr ansientSubscrip tions");

subscription = (ICatalogObject )transientColle ction.Add();
subscription.se t_Value("Name", subName);
subscription.se t_Value("Subscr iberInterface", subscriber);

string eventClassStrin g = "{"+eventClass. GUID.ToString() +"}";
subscription.se t_Value("EventC LSID",eventClas sString);

string sinkString = "{" +sinkInterface. GUID.ToString() + "}";
subscription.se t_Value("Interf aceID",sinkStri ng);

subscription.se t_Value("Method Name",method);
subscription.se t_Value("Filter Criteria","");
subscription.se t_Value("Publis herID","");

// FAILS HERE
transientCollec tion.SaveChange s();
}