I'm sure you are familiar with SSPI errors like the following: SSPI handshake failed with error code 0x80090311, 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. No authority could be contacted for authentication. [CLIENT: <IP>] Trust Well Microsoft has a super easy tool for configuring SPNs called Microsoft® Kerberos Configuration Man