This issue can occur if no SPN has been set for a specific service, please refer to the resolutions in the section 0x7 - KDC_ERR_S_PRINCIPAL_UNKNOWN of the following article to troubleshoot the issue. Service Logons Fail Due to Incorrectly Set SPNs To understand, detect, correct, and verify SPN information, reference the following article: Service Principal Names (SPNs) Additional TechNet Library resources:
Fernando Lugão Veltem edited Revision 4. Comment: removed blank spaces, correct fonts
Kurt L Hudson edited Revision 3. Comment: Updated with appropriate reference
Ed Price MSFT edited Original. Comment: Updated title case and clarified external links.