Remoting crashes IIS

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Hi

I'm busy developing a .NET remoting application. Tcp remoting with a =
binary formatter is used. The user can specify on the client =
configuration whether to connect to the hosted Singleton or SingleCall =
objects. The application consists out of the following:

- Shared assembly

This contains serializable classes that are shared between the server =
and client applications. This also includes interfaces for the server =
classes.

- Server assembly

This assembly implements the various interfaces from the Shared assembly =
and communicates directly with the database. Assembly is hosted in a =
Windows service.

- General assembly

This assembly contains proxy classes and serves as a link between the =
client applications and the server assembly. When an application =
starts, it creates an instance of the General class which in turn =
creates proxy classes to the server classes.

Each proxy class, on creation, calls the RegisterWellKnownServiceType =
for the respective server class. This keeps everything in one place. =
This assembly also provides the Login functionality for all =
applications.

- Client Applications

The client applications have no reference to the Server assembly. When =
the client application starts, an instance of the General class from the =
General assembly is created, which automatically prompts with the login =
screen and configure the remoting classes.

The client application can then just call a function on the correct =
proxy.

E.g. The Employee Management Module can call the =
My.MainObj.EmployeeProxy.Save(EmployeeObj). (MainObj is the General =
class and EmployeeObj is a serializable class from the Shared assembly)

Up to this point... Everything works great. The problem comes in with =
the web application which also uses the General assembly's proxy =
classes.

When I use the web for the first time, it works fine. If I however =
close Internet Explorer and try to access the site again (or try to =
access the site from another computer), I get the following error:


Object reference not set to an instance of an object.=20
Description: An unhandled exception occurred during the execution of the =
current web request. Please review the stack trace for more information =
about the error and where it originated in the code.=20

Exception Details: System.NullReferenceException: Object reference not =
set to an instance of an object.

Source Error:=20

Line 8: Public Sub New(ByVal Parent As =
General.GeneralClient)Line 9: _General =3D ParentLine 10: =
RemotingConfiguration.RegisterWellKnownServiceType( _Line 11: =
=
GetType(ServerInterfaces.IEmployeeManagement), _Line 12: =
String.Format(_General.ServerUrl, =
My.Settings.IEmployeeManagement), _Line 13: =
My.Settings.RemoteAccessMode)=20

In the code above, ServerInterfaces.IEmployeeManagement is the interface =
from the Shared assembly. _General.ServerUrl is the full url to the =
object which is initialized when retrieving the settings for the client =
application (e.g. tcp://10.0.0.10:1921/{0}.rem). =
My.Settings.IEmployeeManagement is the name of the class being hosted =
(for Singleton, it will be "EmployeeManagement". SingleCall will be =
"EmployeeManagement_SC"). My.Settings.RemoteAccessMode will be either =
Singleton or SingleCall.

After this error, the IIS process or something actuallly crashes. If I =
refresh then, it works again.


Any ideas on how to solve this?

Thanks

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