: 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.
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
: Try connecting using the server's IP address. If it works, the issue is almost certainly related to SPN or DNS resolution, as IP connections often fall back to NTLM authentication instead of Kerberos. AI responses may include mistakes. Learn more : If the client resolves the server's IP
Fix "Cannot generate SSPI context" Error in SQL Server - Microsoft Learn
: 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 : Try connecting using the
: A time difference of more than 5 minutes between the client, server, and Domain Controller can break Kerberos tickets.
: Check which account is running the SQL Server service. If it's a domain account, ensure the SPN is registered specifically to that account using the command setspn -L . Learn more Fix "Cannot generate SSPI context" Error
: Recent changes to service accounts or SPNs may not have replicated across all domain controllers yet. Recommended Troubleshooting Steps