Client dies, but hs-agent doesn't.

Hello.
An oracle client connects to an instance and runs a query. That query is sent to a heterogeneous services. A heterogeneous agent-process starts up and manages the query from their. Now, the problem happens when the query takes too long and the user kills the client. The Oracle instance recognizes that the client has been killed and does the necessary clean up work.
However, the heterogeneous agent does not get any message to die. --At least from what I've seen.  So what ends up happening is the agent keeps on processing the query and only exits after the query finishes, which could take hours.
Is there anyway to rectify this situation? For instance, perhaps you can configure agent-startup so that Oracle kills the agent or informs it? Or, maybe there is a way to examine the system tables to detect when you have a dangling HS agent?
thanks.

When you say you installed 11g recently, was this a new installation or an upgrade?
Particularly if this was an upgrade, I would expect you to see this error. You will need to reconfigure EM and re-create the repositories.
emctl stop dbconsole
emca -repos drop
emca -repos create
emca -deconfig dbcontrol db
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That kind of thing...
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