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Karthick P.K on SQL Server

35 Responses to “SQL Server connectivity, Kerberos authentication and SQL Server SPN (Service Principal Name for SQL Server)”

  1. Velmani said

    As always , you will rock with your posts… fantastic one…

  2. Gopalakrishnan Arthanarisamy said

    Excellent Karthick.

  3. Ramraj said

    Nice post…

  4. Vimal said

    Really superb

  5. Ramu said

    Excellent article 🙂

  6. 추숙 said

    Nice post…^___^

  7. Kushagra said

    Just a small question is this possible to that my sessionid’s auth_schme is–> Kerberos for net_transport(TCPID) where as in SQL Server error log the message should be coming like this:–
    The SQL Server Network Interface library could not register the Service Principal Name (SPN) for the SQL Server service. Error: 0x202b, state: 15. Failure to register an SPN may cause integrated authentication to fall back to NTLM instead of Kerberos. This is an informational message. Further action is only required if Kerberos authentication is required by authentication policies.

  8. […] Above error occurs when the kerberos authentication fails in SQL Server you can follow the simple steps below to fix the Kerberos authentication failures. More detailed troubleshooting steps for Kerberos authentication failure is documented in https://mssqlwiki.com/2013/12/09/sql-server-connectivity-kerberos-authentication-and-sql-server-spn-s…   […]

  9. […] SQL Server connectivity, Kerberos authentication and SQL Server SPN (Service Principal Name for SQL&… […]

  10. Asif said

    If sql server database engine and agent are running with two different service account, do we need to follow any thing special while manually registering the SPN, means read service principle name and write service principle name permission should be given to only sql server database engine service account or to both(sql server database engine and agent service account)?

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  19. […] SQL Server connectivity, Kerberos authentication and SQL … – SQL Server connectivity, Kerberos authentication and SQL Server SPN (SQL Server Service Principal Name ) Most of you would already be aware of Kerberos …… […]

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  21. […] SQL Server connectivity, Kerberos authentication and SQL … – SQL Server connectivity, Kerberos authentication and SQL Server SPN (SQL Server Service Principal Name ) Most of you would already be aware of Kerberos …… […]

  22. Faisal said

    the error code that I’m getting in my error log is 0x8009030c
    it is intermittent and can last for several minutes and then clients are able to connect. While this issue happens, I’m able to connect remotely to my standalone SQL 2008 R2. I’m trying to figure out how to track this issue. doesn’t look like an SPN issue but i did verify and the SPN exists. Server has not been restarted recently (so SPNs shouldn’t be automatically getting dropped and recreated)

    2014-11-07 00:00:32.830 spid23s This instance of SQL Server has been using a process ID of 1528 since 10/19/2014 7:06:49 PM (local) 10/19/2014 11:06:49 PM (UTC). This is an informational message only; no user action is required.

    (today being 11/07/2014)

    any thoughts on this one? here’s the full error if that helps.

    2014-11-07 00:11:19.740 Logon Error: 17806, Severity: 20, State: 14.
    2014-11-07 00:11:19.740 Logon SSPI handshake failed with error code 0x8009030c, state 14 while establishing a connection with integrated security; the connection has been closed. Reason: AcceptSecurityContext failed. The Windows error code indicates the cause of failure. [CLIENT: xxx.xx.xx.xx].
    2014-11-07 00:11:19.740 Logon Error: 18452, Severity: 14, State: 1.
    2014-11-07 00:11:19.740 Logon Login failed. The login is from an untrusted domain and cannot be used with Windows authentication. [CLIENT: xxxx.xx.xx.xxx]

    both the client and servers are in the SAME domain, so i know it’s NOT a trust issue. so these messages seem misleading to me.. there’s no other error message in Errorlog right before or after these and there’s no additional info that i can find in the event logs either.

  23. […] SQL Server connectivity, Kerberos authentication and … – SQL Server connectivity, Kerberos authentication and SQL Server SPN (SQL Server Service Principal Name ) Most of you would already be aware of Kerberos …… […]

  24. Roland said

    Hi,
    I’m running a two-node SQL AlwaysOn cluster SRVSQL01 and SRVSQL02 with a few sql server 2012 instances. Clients are connecting via virtual instance name e.g SRVSQLBLA. SQL Server Service is running under a domain service account.

    1) SQL Server itself just tries to register an SPN for the FQDN\Instance and FQDN\PortSQL but no virtual instance names. Server log shows Error: 0x2098 at startup, allthough I set the permissions “read service principle name” and “write service principle name” on the computer account of the cluster nodes for the service account as well as “write public information” on the service account itself.
    I can’t get it to work, SPNs are not getting registered while starting up the sql server instance. With a group membership of Domain Adminstrators or Administrators for the service account registering the SPN at instance startup succeeds.

    2) With manually registered SPNs kerberos is still not working when connecting using the virtual instance name. It’s still using NTLM although I verified the SPNs using setspn -L …
    I registered the SPNs for the FQDN as well as the Netbios name of the virtual instance, for both with the port and instance name.

    Any suggestions?

    Kind Regards,
    Roland

  25. Tommy said

    “ How to Collect Netmon traces and identify Kerberos authentication failure?

    Wait for my next blog
    ”May I know if you have posted this blog:-)

  26. Mat said

    Great post with more information on the subject. Very much appreciate this!

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  28. sqlfrndz said

    Here is the Dead easy way to fix.. It does the same thing as described here but with Nice , easy Interface..called Microsoft® Kerberos Configuration Manager for SQL Server®

    https://www.microsoft.com/en-us/download/details.aspx?id=39046

  29. Venkat said

    Great post. This has really helped me.

    SSPI handshake failed with error code 0x8009030c

    We have done the OS upgrade and started getting this issue. Thanks a lot Karthik

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  31. Scott said

    WOW did this save my tail! I have been working on a difficult customer recreation where we have to create a trusted dual domain SQL setup but for whatever reason no matter what we did the SPN wouldn’t work and we confinued to default to NTLM. Made the ADSIEDIT changes in step 3 and POOF now kerberos is the default protocol on our queries and we can move forward. I spent countless hours troubleshooting the kerberos piece with our remote folks and they were adament about the configuration being off. Turns out that step 3 fixed us up and we are working! Thanks a bunch… what took me 14 hours of work on monday to set the environment up and troubleshoot, was resolved in less than an hour with your doc… 🙂

  32. […] SQL Server connectivity, Kerberos authentication and SQL … – SQL Server connectivity, Kerberos authentication and SQL Server SPN (SQL Server Service Principal Name ) Most of you would already be aware of Kerberos authentication … […]

  33. […] SQL Server connectivity, Kerberos authentication and SQL … – SQL Server connectivity, Kerberos authentication and SQL Server SPN (SQL Server Service Principal Name ) Most of you would already be aware of Kerberos … […]

  34. […] SQL Server connectivity, Kerberos … – … – SQL Server connectivity, Kerberos authentication and SQL Server SPN (SQL Server Service Principal Name ) Most of you would already be aware of Kerberos … […]

  35. […] SQL Server connectivity, Kerberos authentication and SQL Server SPN (Service Principal Name for SQL … […]

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