Microsoft checklist here.

Server list SPNs:

setspn -l %NoodleServiceAccount

Client list cached tickets:

klist get HTTP/%noodle.domain.tld

Client uncache tickets:

klist purge

The following information can be obtained with Wireshark;

 [truncated]Authorization: Negotiate YIG...NER
    GSS-API Generic Security Service Application Program Interface
        OID: 1.3.6.1.5.5.2 (SPNEGO - Simple Protected Negotiation)
        Simple Protected Negotiation
            negTokenInit
                mechTypes: 4 items
                    MechType: 1.2.840.48018.1.2.2 (MS KRB5 - Microsoft Kerberos 5)
                    MechType: 1.2.840.113554.1.2.2 (KRB5 - Kerberos 5)
                    MechType: 1.3.6.1.4.1.311.2.2.30 (NEGOEX - SPNEGO Extended Negotiation Security Mechanism)
                    MechType: 1.3.6.1.4.1.311.2.2.10 (NTLMSSP - Microsoft NTLM Security Support Provider)
                mechToken: 6092a864886...
                krb5_blob: 6092a864886...
                    KRB5 OID: 1.2.840.113554.1.2.2 (KRB5 - Kerberos 5)
                    krb5_tok_id: KRB5_AP_REQ (0x0001)
                    Kerberos
                        ap-req
                            pvno: 5
                            msg-type: krb-ap-req (14)
                            Padding: 0
                            ap-options: 20000000 (mutual-required)
                                0... .... = reserved: False
                                .0.. .... = use-session-key: False
                                ..1. .... = mutual-required: True
                            ticket
                                tkt-vno: 5
                                realm: INTRA.NET
                                sname
                                    name-type: kRB5-NT-SRV-INST (2)
                                    sname-string: 2 items
                                        SNameString: HTTP
                                        SNameString: intra.net
                                enc-part
                                    etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
                                    kvno: 2
                                    cipher: 678ed5435c9ec4d6...
                            authenticator
                                etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
                                cipher: 62a133014138848d900d436...