I'm having an issue where our SQL server (2008 R2) will occasionally return an error [Microsoft][ODBC SQL Server Driver][DBNETLIB]SQL Server does not exist or access denied. After a few minutes or a reboot it resumes normal operation. I checked the logs and find it reports that SQL server is set for Windows auth only. It was and should be always set to mixed mode. What could cause it to change authentication mode without use intervention?
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