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Gen .NET proxy sample test harness receives "(404) Not Found" error when execute the Gen .NET server already deployed to IIS.


Article ID: 7375


Updated On:


Gen Gen - Workstation Toolset Gen - Host Encyclopedia Gen - Run Time Distributed


Gen .NET server PStep TEST_SERVER has been generated, built, assembled and resulting msi file deployed to IIS.

After generation and build of .NET Proxy the sample APP test harness TestServerAppTest.exe fails when execute the server with error "(404) Not Found":

Invoking 'TestServer::Execute(imports)' method.

'TestServer::Execute(imports)' FAILED with exception:

GenException: [Function: NETDynamicCoopFlow::ProcessException]The remote server returned an error: (404) Not Found.

   at tran, IImportWrapper impWrapper, IExportWrapper expWrapper)

   at ca.TestServer.Execute(TestServerImport importView, String comCfg)

   at ProxyTestApplication.DoExecute()


IIS 7.5, 8.5.NET Framework v4.0


Using "CMIDEBUG ON" in commcfg.txt to enable trace,  the trace.out file shows:

06/28/17-10:03:28:631544[4]: NETDynamicCoopFlow::DoFlow(): Remote Server Address: http://localhost:80/ca/TestServer.rem 

06/28/17-10:03:28:662792[4]: NETDynamicCoopFlow::ProcessException(): GenException created: 

06/28/17-10:03:28:662792[4]: GenException: [Function: NETDynamicCoopFlow::ProcessException]The remote server returned an error: (404) Not Found. 

Problem caused by customer's IIS deployment missing the handler mapping for *.rem files.


Add a handler mapping for *.rem files e.g.

Request path: *.rem 

Type: System.Runtime.Remoting.Channels.Http.HttpRemotingHandlerFactory, System.Runtime.Remoting, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089 

Name: HttpRemotingHandlerFactory-rem-Integrated-4.0

Request Restrictions:

  • Mapping: No changes 
  • Verbs tab: Select checkbox "one of the following verbs" and add these values GET,HEAD,POST,DEBUG 
  • Access tab: Select "Script"

Additional Information

Add a Managed Handler Mapping (IIS 7)