Why is my Go application failing to connect to SQL Server with a \'login failed\' error?

Go with SQL Server driver unable to connect successfully, login fail

Problem

I am using Go with the Microsoft SQL Server driver to connect to a database in SQL Server and I am getting a login failed error. I have downloaded the driver package and placed the files in the correct directory. I have also tried opening my SQL database with SQL Server 2014 Management Studio, but it doesn't accept my username or password.

Answer

There are a few things that could be causing this problem:

1. You are not using the correct connection string. The connection string should be in the following format:

"server=servername;user>

Make sure that you are using the correct server name, username, password, and database name.

2. You do not have the correct permissions to connect to the database. Make sure that your user has been granted the necessary permissions to connect to the database.
3. You are not using Windows Authentication. By default, SQL Server uses Windows Authentication. If you want to use SQL Server Authentication, you need to specify the user name and password in the connection string.
4. The SQL Server instance is not configured to allow remote connections. Make sure that the SQL Server instance is configured to allow remote connections.
5. The firewall is blocking the connection. Make sure that the firewall is not blocking the connection to the SQL Server instance.

Additional information

Here is some additional information that may be helpful:

• [Go SQL Server driver documentation](https://github.com/denisenkom/go-mssqldb)
• [SQL Server Connection Strings](https://docs.microsoft.com/en-us/sql/connect/ado-net/connection-strings-for-ado-net)
• [SQL Server Authentication](https://docs.microsoft.com/en-us/sql/connect/security/authentication-modes)
• [Configure Windows Firewall to Allow SQL Server Access](https://docs.microsoft.com/en-us/sql/database-engine/configure-windows-firewall-to-allow-sql-server-access)

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