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In this post, I focus on how NTLM and Kerberos are applied when connecting to SQL Server 2005 and try to explain the design behavor behind several common issues that customers frequently hit. Kerberos VS NTLM NTLM Authentication: Challenge- Response mechanism.
In the NTLM protocol, the client sends the user name to the server; the server generates and sends a challenge to the client; the client encrypts that challenge using the user’s password; and the client sends a response to the server.
Generally, clients must present some form of evidence, known as credentials, proving who they are for authentication. Whether or not IIS controls the password affects the permissions the anonymous user has.
Typically, credentials include a username/password pair. When IIS controls the password, a subauthentication DLL (iissuba.dll) authenticates the user using a network logon.
The function of this DLL is to validate the password supplied by IIS and to inform Windows that the password is valid, thereby authenticating the client.
However, it does not actually provide a password to Windows.
The problem occurs when I attempt to use the proxy from a client PC, where it immediately falls back to basic authentication.
It is registered in Active Directory under either a computer account or a user account.If it is a local user account, server validate user’s response by looking into the Security Account Manager; if domain user account, server forward the response to domain controller for validating and retrive group policy of the user account, then construct an access token and establish a session for the use. Kerberos authentication provides a mechanism for mutual authentication between a client and a server on an open network.The three heads of Kerberos comprise the Key Distribution Center (KDC), the client user and the server with the desired service to access.When a domain controller successfully authenticates a user via NTLM (instead of Kerberos), the DC logs this event.This specifies which user account who logged on (Account Name) as well as the client computer's name from which the user initiated the logon in the Workstation field. This event is also logged on member servers and workstations when someone attempts to logon with a local account.