RE: UnregisterChannel Issue in remoting

Hello Mathai,

From your post, my understanding on this issue is: you wondered why the
security settings were kept when you unregistered the TcpChannel to a .net
remoting server and register the channel again with an incorrect password
and username. If I'm off base, please feel free to let me know.

I reproduced your issue in the attached test project. (The attachment can
be downloaded with Outlook Express or Windows Mail).
In that test project, there are two remote types: RemoteObject and
RemoteLife. In the client side code, I first registered a TcpChannel with
correct user name and password, then registered the remote type:
RemoteObject and create an instance of RemoteObject to call its method:
GetCount. All these operations were ok.

Then I unregistered the TcpChannel
(ChannelServices.UnregisterChannel(clientChannel)) and registered a new
TcpChannel with incorrect password. When I tried to register the remote
type: RemoteObject again
(RemotingConfiguration.RegisterWellKnownClientType(remoteType);), I found I
could not do that because RemoteObject has already been registered during
the first TcpChannel connection. Thus I commented that line and started to
register another remote type: RemoteLife. Finally, I created an instance of
RemoteObject and called its function successfully as you said. But when I
called the function of an instance of RemoteLife, it failed because of the
unauthorized connection. Therefore, my conclusion is that the call the
RemoteObject is actually still using the authorized registered type in the
first phase. We need to unregister the remote type after the channel is
unregistered, and register the remote type again in the new channel.

Thus, the current problem is how to unregister a remote type.

There is no 'unregister' methods available in RemoteingConfiguration.
RemotingConfiguration.Configure() won't help as well. According to the MSDN
article: http://msdn2.microsoft.com/en-us/library/ms973857.aspx, Channels
are registered per application domain. There can be multiple application
domains in a single process. When a process dies, all channels that it
registers are automatically destroyed. Therefore, the workaround is to
create a secondary AppDomain in your application and call
RemotingConfiguration.Configure() from this newly created AppDomain. When
you are done with your first channel connection, you can unload the
AppDomain and start with a new domain instead. Hope it helps.

Besides, I have sent emails to our development team to confirm this
behavior of Remoting. I will also do further researches for other
workarounds.

Please let me know if you have any other concerns, or need anything else.

Sincerely,
Jialiang Ge (jialge@xxxxxxxxxxxxxxxxxxxx, remove 'online.')
Microsoft Online Community Support

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Attachment: Sample.zip
Description: Binary data

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