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AuthLite Interactive Documentation
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When your SQL service (and/or reporting service) is using a bespoke domain user service account e.g. “sandbox\My_SQL_svc” then the Kerberos principal names have to be correct, or else AuthLite users won't be able to connect.

  • Install the Microsoft SQL Configuration Manager on the sql server. 
  • See its "Install Instructions" on that page for how to launch it.
  • When running its exe after install, make sure to launch it "run as administrator". 
  • Connect (leave items blank for local server)
  • Go to SPNs tab. You can Fix any SPNs it identifies as wrong or missing. 
  • Also AuthLite is needed on the machine you're using to open the SQL tools. 
  • Lastly, if you are connecting to a FQDN that's a DNS alias (instead of the real server name) you need to set up SPNs for that too.

Microsoft has an additional page Using Kerberos Configuration Manager for SQL Server that has more information and instructions about their tool.