Silverlight Wcf method receives the exception even after the WCF service executed successfully

About my application:

Application built in silver light. It upload the file into server and reads all the records from the file and validates it and Inserts into database table. The below issue occurs only when I run the application in IIS and upload the large file having 50,000 records.

When I host the appli开发者_运维知识库cation in IIS and browse the application with machine name then Wcf service returns an error even after service is executed successfully. Wcf service is successfully returns by inserting all the data into database table but when it reaches to silver light completed event it shows exception.

But strange is when I browse the application using "localhost" it works properly.

Application is hosted using IIS 5 and Set Windows Authentication.

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Increase the WCF Binding timeout (sendTimeout)