Event ID 4776, The computer attempted to verify the account's credentials

php editor Baicao is here to share with you an important event ID 4776 regarding computer security, that is, the computer attempts to verify the credentials of the account. This event ID refers to the computer trying to authenticate using incorrect credentials when authenticating a user to log in. This may be due to the user entering an incorrect username or password, or due to a malicious attack on the computer system. Understanding the meaning and cause of this event ID can help us better protect personal and corporate computer security.

When you encounter event ID 4776, it means that a domain controller or computer is trying to verify the account's credentials. This event provides key details about the origin of the authentication attempt. This article will focus on the importance of this message.

What is Event ID 4776?

Event ID 4776 is a log event used to record the situation where a domain controller (DC) or local SAM is used as the login server to verify account credentials using NTLM (NT LAN Manager). This event applies to domain controllers, workstations, and Windows servers. NTLM is the default authentication system for local logins.

Every login attempt on a domain controller is logged in the DC, and the success or failure of validating credentials via NTLM generates event ID 4776. Additionally, logging into the local computer via a local SAM account also generates event ID 4776.

The following are the elements contained in Event ID 4776:

Authentication Package – "MICROSOFT_AUTHENTICATION_PACKAGE_V1_0". Login Account – The account name of the user or computer trying to log in. Login accounts can also be a well-known security principle. Source Workstation – This displays the name of the client computer used to create the login. Error code – Indicates whether the verification succeeded or failed. If the error code displays 0x0, the credentials were successfully verified. If it is not 0x0, the credentials are not verified. In this case, the field will display Authentication Failure – Event ID 4776 (F).

Event ID 4776, The computer attempted to verify the account's credentials

While a failed attempt with Event Log 4776 may not always be a cause for concern, sometimes it may be, such as with a rainbow attack. When you encounter this situation, you can troubleshoot the problem by following the steps below:

1] Verify Windows Security Log Event ID 4776 via NTLM

3] Check the accompanying error code

The accompanying error code will point you in the direction you must troubleshoot.

Here is more information about Microsoft's Windows Security Log event ID 4776.

What is the difference between event ID 4776 and 4624?

Event ID 4776 indicates that the login attempt failed and the account is locked, possibly due to an incorrect password or ID. Event ID 4624 indicates successful login. When the domain controller is reachable, you can see event ID 4776 in the Windows Security log. And 4624 occurs when credentials are retained in the local computer or the system cannot access the domain controller.

What is the event ID for Kerberos authentication failure?

Kerberos authentication errors trigger event ID 4771. It registers security audit log messages in Windows that occur when user pre-authentication attempts with Kerberos fail. This message informs users and computers why authentication failed.

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