problem with a long process

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C#

ASP.NET

My situation is this:

was created a page that will run a long process . ... This process consists in:
- Read a file. Csv, for each row of the file wil be created an invoice...in the end of this process shows a successful message.

for this it was decided to use an updatepanel so that the process is asynchronous and can display an UpdateProgress while waiting to finish the process ... for this in the property of scriptmanagment was added the AsyncPostBackTimeout = 7200 (2 hours) and also timeout was increased in the web.config of the app as in qa and production servers.

Tests were made in the localhost as a qa server and works very well, the problem arises when testing the functionality on the production server.

that makes:
file is loaded and starts the process ... during this period is running the UpdateProgress but is only taking between 1 or 2 min and ends the execution without displaying the last message, as if truncated the process. When reviewing the invoices created are creating only the top 10 records of the file.(from a file with 50,100 o + rows)

so I would like to help me with this, because i don't know what could be wrong.