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02.29.2008 at 12:07PM PST, ID: 23204905
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TCP exception when attempting to use an object library within a service application

Tags: .NET c#, System.Runtime.Remoting.RemotingException: The remoting custom errors mode had already been set.
I am attempting to use an internallly developed DLL library to execute a specific scan task.  The task connects to a server on the network where the scanning software is installed and tells the server to start the scan.

If I put the DLL into a console application, I can create a task object, execute the scan and complete the process without a problem.

If I put the same code into a Windows Service and have this application execute the scan, I get a very cryptic exception and am not able to find information on this specific problem.  The error message I get when attempting to start the scan appears to come from when the object attempts to open a TCP connection to the scan server.

The help I find by googling Remoting Exceptions suggest using App Domains, but as that would separate the communication between the service and the scanning object, that would defeat our purposes.  If you have any information on this exception I thank you in advance.

Error occurred in starting the task. TCP Channel Registration Failed. ---> System.Runtime.Remoting.RemotingException: The remoting custom errors mode had already been set.
   at System.Runtime.Remoting.RemotingConfigHandler.set_CustomErrorsMode(CustomErrorsModes value)
   at System.Runtime.Remoting.RemotingConfiguration.set_CustomErrorsMode(CustomErrorsModes value)
   at CustomSoftwareName.LibraryName.FileTask.Start(String serverName, String portNumber)
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Question Stats
Zone: Programming
Question Asked By: TimDg
Solution Provided By: TimDg
Participating Experts: 1
Solution Grade: A
Views: 0
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02.29.2008 at 07:07PM PST, ID: 21019679

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02.29.2008 at 08:54PM PST, ID: 21020022

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02.29.2008 at 07:07PM PST, ID: 21019679
Are you able to step through the internally developed dll for debugging? What account is the service running under? What are the permissions set on the directory you are running the service from? When you call the scan method are you surrounding it with error handlers by catching ex as System.Runtime.Remoting.RemotingException and logging ex.message to the event log?

Assisted Solution
 
02.29.2008 at 08:54PM PST, ID: 21020022
It was actually determined that the DLL is causing the error the second time a scan is executed.  Since the console app only executes one scan, and the service executed multiple, the error would show up form the service.

On the second scan execution, connection parameters are attempting to set that were already set on the first run, and the resulting exception happens.
Accepted Solution
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628