Connection Failed:Nested Exception.Native connection to the backend system

Hi Experts,

   I am using VC 7.0.I have designed a model i have deployed it in the development it works fine.I have transported the iviews with the par file to Q.I could able to see the iview.But when i preview it its throwing below error:

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Connection closed before service executed

Connection Failed:Nested Exception.Native connection to the backend system is broken

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I checked the corresponding system in QA all the connection test were successful.

Anybody faced this issue before ?If so can you please provide the solution.

Naga