NAV 2009: Dynamics NAV server cannot connect

The microsoft Dynamics NAV server cannot connect the change listener to SQL server
due to the following error Cannot open database"Demo dtabase NAV(6-0)" request by login.
The login failed for the user’NT Authority \Network Service’.

I am using NAV 2009 with SQL server 2008.

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Check with config.xml file, whether database or sql instance is correct.