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MS SQL Server is accessible locally but not over the internet

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http://serverfault.com – When I try to access a named instance of Microsoft SQL server 2008 R2 SP2 on the local network, I have no problem. But when access it outside office from the internet, I can not connect to the database server. It send back the "famous" following error: A network-related or instance-specific error occured while establishing a connection to SQL Server. The server was not found or was not accessible. Verify the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) This er (HowTos)