Remoting NullReferenceException problem

[Tomislav Bartolin]

Hi,

I have a singleton and a singlecall MBR objects hosted by IIS.
Singleton object can be activated either by the singlecall object or by the
remote client application.
I want the singleton object to stay active for an infinite amount of time
so I've overriden its InitializeLifetimeService function and return nothing.
This works just fine, well, almost.
The problem is that after some time of inactivity from the client app (it
appears to be about 15 minutes) I get
a System.NullReferenceException from system.dll which I cannot debug.
Call stack says: ">
system.dll!System.Net.Sockets.OverlappedAsyncResul t.CompletionPortCallback(u
int errorCode = 64, uint numBytes = 0, System.Threading.NativeOverlapped*
nativeOverlapped = 1718520) + 0xa0 bytes ".
After that client app stops responding and freezes. Application doesn't use
any events or callbacks.
I'm using HTTP channel with binary formatter, which is set in web.config
file like this:
<channels>
<channel ref="http"/>
</channels>

And in remote client app like this:

Dim chanProps As New ListDictionary
chanProps("name") = "httpbinchan"
Dim chan As New HttpChannel(chanProps, New
BinaryClientFormatterSinkProvider, New BinaryServerFormatterSinkProvider)
ChannelServices.RegisterChannel(chan)

Am I missing something here ?
Any help in getting rid of this unwanted "feature" would be greatly
appreciated.
Thanks

--
Bartol
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