One-Way ASP.NET web service loses credentials / impersonation

I have an ASP.NET web service that access a variety of COM objects and performs a variety of tasks.

One of the methods can take a very, very long time (5 minutes perhaps).  To get around this, I had marked the service as one way ( [SoapDocumentMethod(OneWay = true)] ).

For some reason, when executing the method is marked as OneWay, it loses the credentials and starts running as the machine account (MACHINENAME$).  When not marked as OneWay, the method executes as whatever user is configured.

I've tried changing the anonymous access user in IIS, using impersonation etc. but to no avail.  It works fine, as long as it is not a one way method.

HELP PLEASE!!!!
chrisIericksonAsked:
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chrisIericksonAuthor Commented:
I ended up just changing the identity the application pool is running under.  Apparantly all one-way methods, along with child threads are run under the process identity, regardless of <identity impersonate ='true'/>
It seems funny that no 'experts' were able to suggest this.
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chrisIericksonAuthor Commented:
I found the following comment:

"But what about the simple case of launching a fire-and-forget Web Service from an ASP.NET page. Currently marking the Web Service with the oneway=true attribute does not propogate the thread context (making database connection impossible). Waiting for the end method or an asynchronous call holds up the page. " (http://weblogs.asp.net/despos/archive/2005/10/19/427861.aspx)

It is from 2005, and talking about ASP.NET 1.1.  I'm not sure if this has been fixed in 2.0 or not.

If it is caused by losing the thread context, is there a work around?
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Robbie_LeggettCommented:
I'm by no means an ASP expert, but could this have something to do with the number of hops the credentials have to make? Is only 1 hop supported?

:-)
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chrisIericksonAuthor Commented:
Only 1 hop is supported, true.  I don't believe it is making multiple hops here.  For whatever reason, it seems that the thread context is lost when using one way methods on web services.  I'm trying to figure out what the standard practice is for a one-way method (or fire and forget method) to keep the privileges or credentials its class has.
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