How to verify SQL Server is using NTLM / Kerberos authentication

You can execute the below TSQL Query to verify authentication used by SQL Server Connections.

USE master
GO

SELECT auth_scheme FROM sys.dm_exec_connections 
WHERE session_id = @@SPID;
GO

Expected Results

SQL – When SQL Server authentication is used
NTLM – When NTLM authentication is used
KERBEROS – When KERBEROS authentication is used

Reference

How to Verify and Register SPN for SQL Server Authentication with Kerberos Connections

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