Installing NAV 2015 Build 41779 using a 3 tier setup. Error occurs “Cannot establish a connection to the SQL Server/Database.”

Installing NAV 2015 Build 41779 using a 3 tier setup. Error occurs “Cannot establish a connection to the SQL Server/Database.”

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This article will guide you as how to avoid this error during installing NAV 2015 using a 3 Tier Setup:

Cannot establish a connection to the SQL Server/Database.

This could be caused by one of the following reasons:

  • The SQL Server was not started
  • The Database does not exist
  • Proper permissions have not been given to the NAV Server Account

Here are the event viewer error logs:

This took me more than a day to solve. It was such a silly issue. I was logged on as a Local Administrator when i installed the SQL Database Components on the SQL Server. When i logged in as the Domain Administrator and reinstalled the SQL Database Components this resolved the issue.

Installation Steps


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