Cannot offer remote assistance to Vista

Hi ,

I am in a windows 2003 Domain and have the following problem when using
remote assistance:

I can offer remote assistance to all Xp workstations but not to any Windows
Vista workstation. When I offer remote assistance to a windows Vista machine
I receive an error stating that " your offer to help could not be sent".

Furthermore the following event is registered in the novice machine:

Log Name: System
Source: Microsoft-Windows-DistributedCOM
Date: 5/14/2008 8:52:16 AM
Event ID: 10016
Task Category: None
Level: Error
Keywords: Classic
User: WINCUR\inocente
Computer: curoil-varsovia.corp.curoil.com
Description:
The application-specific permission settings do not grant Remote Activation
permission for the COM Server application with CLSID
{3C3A70A7-A468-49B9-8ADA-28E11FCCAD5D}
to the user WINCUR\inocente SID
(S-1-5-21-2067679335-91960342-1233803906-2438) from address 192.168.1.178.
This security permission can be modified using the Component Services
administrative tool.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-DistributedCOM"
Guid="{1B562E86-B7AA-4131-BADC-B6F3A001407E}" EventSourceName="DCOM" />
<EventID Qualifiers="49152">10016</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2008-05-14T12:52:16.000Z" />
<EventRecordID>39712</EventRecordID>
<Correlation />
<Execution ProcessID="0" ThreadID="0" />
<Channel>System</Channel>
<Computer>curoil-varsovia.corp.curoil.com</Computer>
<Security UserID="S-1-5-21-2067679335-91960342-1233803906-2438" />
</System>
<EventData>
<Data Name="param1">application-specific</Data>
<Data Name="param2">Remote</Data>
<Data Name="param3">Activation</Data>
<Data Name="param4">{3C3A70A7-A468-49B9-8ADA-28E11FCCAD5D}</Data>
<Data Name="param5">WINCUR</Data>
<Data Name="param6">inocente</Data>
<Data Name="param7">S-1-5-21-2067679335-91960342-1233803906-2438</Data>
<Data Name="param8">192.168.1.178</Data>
</EventData>
</Event>



My Windows Vista workstations are running Windows Vista Enterprise Edition
with SP1.

Any idea what is causing this behavour?


--
Urvin