RODBC odbcDriverConnect() Connection Error

The correct syntax should be:

odbcDriverConnect('driver={SQL Server};server=servername\\instancename,port;database=testing;uid=abc;pwd=123456')

If you use Windows Authentication method:

odbcDriverConnect('driver={SQL Server};server=servername\\\\instancename,port;database=testing;trusted_connection=true')

Slash seems like an escape character, escaping slash works.

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