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This is the process: 1. The user enters her logon credentials. 2. The Local Security Authority (LSA) hashes the entered password and then uses it to encrypt the machine time. A plain-text copy of the same timestamp is packaged with the encrypted version. This package, called the authenticator, is passed by the LSA to the Kerberos package on the client. 3. The authenticator is sent to the Kerberos Distribution Center (KDC) or account database on a domain controller.

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takes 60 seconds) and displays it in the Resource and Performance Monitor, as shown in Figure 13-5. You can scroll down the report and expand any of its sections.

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9 From the master list of available drivers, which will look similar to the one shown in Figure 5-6, select the device manufacturer and the correct model. Click Next to continue. Follow the prompts to complete the wizard.

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On the final page, the wizard reports on the result of the installation. If you encounter any problems, follow the troubleshooting links listed there.

Figure 5-6. This master list shows all available device drivers, broken down by category and by manufacturer.

4. The KDC compares the plain-text timestamp with its own system time. If the time difference is not within the Kerberos policy Maximum tolerance for computer clock synchronization, the request is dropped. Otherwise, the process continues. The Kerberos policy is part of the Account Policies of the GPO linked to the domain. 5. The KDC encrypts the plain-text timestamp using the stored password hash of the user and compares the result to the presented encrypted timestamp. 6. If the results match, the user is authenticated and sent a TGT. The TGT includes information encrypted using the password it has of the user s computer, and thus it can be used only by that computer. It also includes authorization information in the form of a list of SIDs, including the user s SID and the SIDs of the groups she is a member of.

Knowing what hardware drivers are installed on your computer can make a huge difference when it comes to troubleshooting problems or configuring advanced features for a device. In every case, your starting point is Device Manager, a graphical utility that provides detailed information about all installed hardware, along with controls that you can use to configure devices, assign resources, and set advanced options. To open Device Manager, use any of the following techniques:

This is the process: 1. When the user requests access to a resource, a session ticket must be obtained. The TGT is returned to the KDC along with a fresh authenticator and a request for a specific resource. 2. The KDC checks the plain-text timestamp in the authenticator and rejects the request if the time difference between this stamp and its own clock is greater than the time skew. Otherwise, the inspection continues. 3. The KDC encrypts the plain-text timestamp using the user s password hash from the account database and comparing it to the encrypted timestamp in the authen ticator. 4. If there is a match, a session ticket is prepared and sent to the user. Part of the session ticket is encrypted using the password hash of the user s machine account so that it can be read and stored by the user s computer. Part of the session ticket is encrypted using the password hash of the computer account on which the service or resource resides that the user has requested access to. This allows that computer to know that the material is provided by the KDC. (Only the KDC could know its password.) 5. The session ticket can be used to authenticate to the resource computer.

From any command prompt, type devmgmt.msc. Right-click the My Computer icon on the Start menu or the desktop, choose Manage,

and then select Device Manager from the left pane of the Computer Management console, under System Tools.

The LAN Manager (LM) protocol was developed many years ago by Microsoft and was first used by the network client developed for early versions of Windows. It is a chal lenge/response network authentication protocol. The LAN Manager challenge/ response process is as follows:

From Control Panel, double-click the System icon and click the Device Manager but-

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Figure 13-5: System diagnostics report in the Resource and Performance Monitor For example, expanding the failed basic system check called Hardware Device And Driver Checks in the Resource and Performance Monitor results in the screen shown in Figure 13-6, which indicates there are problems with three of the Plug and Play (PnP) devices.