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I am trying to find out why there is no Kerberos authentication on my SQL instance :

SELECT COUNT (auth_scheme) as nb, auth_scheme --net_transport, client_net_address 
FROM sys.dm_exec_connections
GROUP BY auth_scheme

nb auth_scheme

2 (Unknown)

151 NTLM

4 SQL

Using KerberosConfigurationManager, requiered SPNs seems to be correctly and automatically registered:

enter image description here

Here's the error log regarding the SPN for the instance :

enter image description here

Could you provide ideas to investigate why there is no Kerberos authentication?

All the conditions list at this Microsoft Docs page have been met.

EDIT :

Cannot add the output because this is confidential info, but the instance is correctly registered :

MSSQLSvc/hostname.domainName.fr:instanceName

2
  • Are the clients connecting from a remote host using host name that matches the SPN? May 3, 2018 at 15:59
  • Unfortunatelly I have no idea David, I am only working on the database side. maybe i could put in place a profiler trace in order to get more details ?
    – Mickael
    May 4, 2018 at 7:30

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