: Run setspn -X to search for any duplicate SPNs in your domain, which often causes this specific error.
The error message typically signals a failure in Kerberos authentication between a client and a SQL Server. It usually means the client cannot verify the identity of the server because of a mismatch or issue with the Service Principal Name (SPN) . Common Root Causes : Run setspn -X to search for any
: The SPN might be missing, duplicated, or registered to the wrong service account (e.g., registered to a domain user when the service is running as LocalSystem ). Common Root Causes : The SPN might be
Fix "Cannot generate SSPI context" Error in SQL Server - Microsoft Learn : A time difference of more than 5
: This official tool from Microsoft Learn can scan your SQL instance and automatically identify missing or misconfigured SPNs.
: If the client resolves the server's IP address to a different name than what is stored in Active Directory, the Kerberos ticket request will fail.
: A time difference of more than 5 minutes between the client, server, and Domain Controller can break Kerberos tickets.