Microsoft SQL: Login failed for user ‘sa’. (.Net SqlClient Data Provider)

Error:
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Cannot connect to SQL-SERVER
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Login failed for user 'sa'. (.Net SqlClient Data Provider)
Resolution:

1. Ensure that the ‘sa’ account is enabled: security > right click user sa > Properties > Status > Enabled > save
2. Enable SQL Server & Windows authentication: right click on the server > Security > select radio button next to ‘SQL and Windows Mode’ > restart SQL or the OS

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