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Windows Event ID 4768 for Kerberos Authentication

Craig Smilowitz | 8 min read| Updated On - March 29, 2024

Event ID 4768

Have you ever pondered over the intricacies of digital security in a world where data breaches lurk around every digital corner? Picture this: you’re safeguarding your organization’s network, but are you certain that every user accessing it is who they claim to be? Enter Kerberos, the guardian angel of network authentication. But here’s the catch: how do you ensure Kerberos itself isn’t compromised? The answer lies within Event ID 4768, the gateway to deciphering Kerberos authentication tickets.

Event ID 4768 Components

Windows Event ID 4768

Account Information

Account Name: Specifies the name of the account for which a Ticket Granting Ticket (TGT) was requested. Notably, computer account names end with a $ symbol.

Supplied Realm Name: Identifies the Kerberos Realm to which the Account Name belongs.

User ID: Represents the Security Identifier (SID) of the account that requested a TGT. If the SID cannot be resolved, the source data appears in the event.

Service Information

Service Name: Indicates the name of the service in the Kerberos Realm to which the TGT request was sent.

Service ID: Denotes the SID of the service account in the Kerberos Realm to which the TGT request was sent.

Network Information

Client Address: Specifies the IP address of the computer from which the TGT request was received.

Client Port: Indicates the source port number of the client network connection. It’s typically “0” for local (localhost) requests.

Additional Information

Ticket Options: Represents a set of different ticket flags in hexadecimal format, including values like Forwardable, Renewable, Canonicalize, and Renewable-ok.

Result Code: Displays a set of different failure codes in hexadecimal format, providing insights into the outcome of the authentication attempt. Possible causes are varied, including issues like expired passwords, invalid credentials, or unsupported encryption types.

Ticket Encryption Type: Specifies the cryptographic suite used for issuing the TGT, such as DES, AES, or RC4.

Pre-Authentication Type: Indicates the code number of the pre-authentication type used for the TGT request, offering details about the authentication method employed.

Certificate Issuer Name: Identifies the name of the Certificate Authority (CA) that issued the smart card certificate.

Certificate Serial Number: Represents the serial number of the smart card certificate used during logon.

Certificate Thumbprint: Denotes the thumbprint of the smart card certificate, providing a unique identifier for authentication purposes.

Event 4768 Result Codes

Result code Kerberos RFC description Notes on common failure codes
0x1 Client’s entry in database has expired
0x2 Server’s entry in database has expired
0x3 Requested protocol version # not supported
0x4 Client’s key encrypted in old master key
0x5 Server’s key encrypted in old master key
0x6 Client not found in Kerberos database Bad user name, or new computer/user account has not replicated to DC yet
0x7 Server not found in Kerberos database New computer account has not replicated yet or computer is pre-w2k
0x8 Multiple principal entries in database
0x9 The client or server has a null key Administrator should reset the password on the account
0xA Ticket not eligible for postdating
0xB Requested start time is later than end time
0xC KDC policy rejects request Workstation restriction, or Authentication Policy Silo (look for event ID 4820)
0xD KDC cannot accommodate requested option
0xE KDC has no support for encryption type
0xF KDC has no support for checksum type
0x10 KDC has no support for padata type
0x11 KDC has no support for transited type
0x12 Clients credentials have been revoked Account disabled, expired, locked out, logon hours.
0x13 Credentials for server have been revoked
0x14 TGT has been revoked
0x15 Client not yet valid – try again later
0x16 Server not yet valid – try again later
0x17 Password has expired The user’s password has expired.
0x18 Pre-authentication information was invalid Usually means bad password
0x19 Additional pre-authentication required*
0x1F Integrity check on decrypted field failed
0x20 Ticket expired Frequently logged by computer accounts
0x21 Ticket not yet valid
0x22 Request is a replay
0x23 The ticket isn’t for us
0x24 Ticket and authenticator don’t match
0x25 Clock skew too great Workstation’s clock too far out of sync with the DC’s
0x26 Incorrect net address IP address change?
0x27 Protocol version mismatch

Invalid msg type
0x29 Message stream modified
0x2A Message out of order
0x2C Specified version of key is not available
0x2D Service key not available
0x2E Mutual authentication failed May be a memory allocation failure
0x2F Incorrect message direction
0x30 Alternative authentication method required*
0x31 Incorrect sequence number in message
0x32 Inappropriate type of checksum in message
0x3C Generic error (description in e-text)
0x3D Field is too long for this implementation

How Does Kerberos Authentication Align with Event ID 4768?

Within the intricate maze of network security, Kerberos emerges as a steadfast guardian, meticulously validating the identities of users as they navigate the digital landscape. Fundamentally, Kerberos functions as a robust network authentication protocol, meticulously crafted to facilitate secure communication over inherently non-secure networks. Yet, amid the tumultuous skirmishes of the digital realm, one event shines with unparalleled importance – Event ID 4768. Like a beacon piercing through the darkness, Event ID 4768 serves as a guiding light, illuminating the intricate path of Kerberos authentication and unraveling its mysteries within the labyrinth of network security.

As organizations strive to fortify their digital perimeters against ever-evolving cyber threats, understanding the nuances of Kerberos authentication and the role of Event ID 4768 becomes paramount. This introductory event marks the initiation of a complex authentication process, where users seek access to network resources through the procurement of Ticket Granting Tickets (TGTs) from the Key Distribution Center (KDC). However, beyond its surface significance lies a deeper layer of complexity. While Event ID 4768 heralds the commencement of the authentication exchange, it often conceals crucial details vital for effective security monitoring, such as the identity of the user initiating the request. Thus, amidst the intricate dance of network security, Event ID 4768 emerges as a focal point, compelling organizations to delve deeper into its implications and decipher its role in safeguarding digital assets against the relentless tide of cyber threats.

Understanding Event ID 4768

Understanding Event ID 4768

A. Ticket Granting Ticket (TGT)

At the core of Kerberos authentication lies the Ticket Granting Ticket (TGT), a digital key granting access to the network’s inner sanctum. Far beyond a mere credential, the TGT acts as the cornerstone of secure traversal across the digital landscape. It encapsulates the user’s authenticated identity, enabling seamless interaction with network resources while maintaining robust security protocols.

B. The Ritual of TGT Procurement

Event ID 4768 serves as the herald, signaling the commencement of the TGT procurement process. When a user seeks access to network resources, they embark on a journey orchestrated by the Key Distribution Center (KDC). This journey entails a series of cryptographic exchanges, culminating in the issuance of the coveted TGT. Event ID 4768 captures the essence of this ritual, offering insights into the intricate mechanisms governing user authentication within the Kerberos framework.

C. Unveiling the Veil of Secrecy

Despite its significance, Event ID 4768 operates within the confines of certain limitations. Notably, the event fails to disclose critical details, such as the identity of the user requesting the TGT. This omission poses challenges for security administrators, who must navigate the digital landscape armed with incomplete information. However, despite its limitations, Event ID 4768 remains a valuable tool in the arsenal of security professionals, offering glimpses into the inner workings of Kerberos authentication and guiding organizations towards enhanced network security practices.

In essence, understanding Event ID 4768 transcends mere technical proficiency; it necessitates a comprehensive grasp of the symbiotic relationship between Kerberos authentication and network security. By navigating the intricate nuances of this event, organizations can bolster their defenses against potential threats and navigate the digital landscape with confidence and resilience.

Why Monitor Event ID 4768?

In today’s dynamic cybersecurity landscape, vigilant monitoring of Event ID 4768 is essential for safeguarding digital environments. This event holds significant importance due to its various security benefits and compliance imperatives.

Security benefits associated with Event ID 4768 include the detection of potential privilege abuse. Monitoring helps identify unauthorized attempts to exploit elevated privileges, preventing potential breaches. It also aids in identifying suspicious activity, such as the Pass-the-Ticket technique, enabling prompt response measures. Additionally, organizations gain valuable insights into user interactions, aiding auditing processes and detecting anomalous behaviors indicating security risks.

Monitoring Event ID 4768 is crucial for meeting compliance requirements. Regulatory mandates necessitate Kerberos authentication event monitoring, including Event ID 4768, as a foundational element of compliance frameworks. Compliance obligations often demand specific security controls to protect sensitive data and ensure IT system integrity, with Event ID 4768 monitoring playing a vital role in demonstrating compliance. Compliance with industry standards builds trust among stakeholders, highlighting the strategic importance of monitoring Event ID 4768 in the ongoing fight against cyber threats.


In the ever-evolving landscape of digital security, Event ID 4768 emerges as a beacon, guiding the vigilant towards a realm of heightened awareness. By deciphering the cryptic messages embedded within this event, organizations can fortify their defenses against the machinations of digital adversaries. So, the next time Event ID 4768 graces your security logs, seize the opportunity to unveil its secrets and fortify the bastions of network security.

By understanding the nuances of Kerberos authentication and the significance of Event ID 4768, IT professionals can wield this knowledge as a potent weapon in the ongoing battle for digital sovereignty. So, as you traverse the digital frontier, remember – vigilance is the watchword, and Event ID 4768 is your compass guiding towards secure horizons.

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