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Download and install the Resource Kit utilities Kerbtray.exe and Klist.exe. Make sure a copy is available on the logon client. Start Network Monitor and start a capture prior to logon. Optionally, make a folder on the domain controller to store network captures and a copy of the Security Event log. This folder can be temporarily shared to download these files to the server for examination. This way, you can study them while observing the details in the local Security Event log and looking at the tickets in the Kerberos cache. It is much easier than constantly moving between two com puters or setting up a terminal session.

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For the purposes of our example captures, from which screen shots for the figures were taken, a folder was created and named Captures. In addition, a small text file was created with the words Hello World in it. After the capture was started on the domain controller, the client server, a domain member server, was rebooted. Then the Admin istrator account was used for logon to the domain from the member server. After suc cessful logon, the capture was stopped and saved to the folder. A copy of the Security Event log was also saved to the folder. Kerberos at Computer Boot When a domain member server running Windows 2003 Server starts, it must authenticate to the domain controller. The first step is a query to find a domain controller. Figure 11-11 shows the DNS query, looking for the Lightweight Directory Access Protocol (LDAP) service.

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general alert to provide additional specific notifications related to all port-scan attacks, ping-of-death attacks, or other conditions.

The Quota Entries dialog box displays disk storage per user and whether that storage is at or above warning levels or limits. You can sort by column to identify users who have exceeded their quota levels or limits. There is no mechanism to alert you about quota limits, so you must monitor the Quota Entries dialog box or the System Log in Event Viewer.

Figure 11-11

Alert events define actions that occur on the computer running ISA Server that can raise alerts. Alert conditions are additional criteria applied by ISA Server when alert events happen. For example, DNS intrusion is an alert event. Additional conditions that you can apply to the alert event include raising an alert when any DNS intrusion attempt is detected, or raising an alert only when specific DNS intrusion attempts are detected. You can also modify the event trigger-threshold limits. The trigger threshold refers to how many times the event should occur before the alert is triggered and how long to wait before issuing the alert again.

Monitoring Network Protocol Security 11-41

To configure alert events and conditions, complete the following steps: 1. In ISA Server Management Console, click Monitoring and then click the Alerts view. 2. In the Task pane, click Configure Alert Definitions. The Alert Definitions dialog box, shown in Figure 11-4, displays all the alert definitions.

Figure 11-12

3. To enable or disable an Alert Definition that is already configured, click the check box next to the desired alert. 4. Select the Alert Definition you want to configure and then click Edit.

Next, the server sends a UDP query to the Kerberos port, 88, on the DC, and is answered by the DC. This is the server s request for a Ticket Granting Ticket (TGT). Figure 11-13 shows a portion of this packet. Of course, the TGT is necessary and must be presented before any resources can be accessed. The request is, in essence, the Hey, here I am! Let me in the door! speech and includes the server s credentials. The server s account password is used as the key in a cryptographic hash of a timestamp. A plaintext copy of the timestamp also accompanies the hash. On the domain controller, the server time from the unencrypted timestamp is com pared to the DC s time. By default, if the time is off by more than 5 minutes, the logon is rejected. (If Kerberos fails, NTLM might be attempted, for example, when mapping drives.) If the time is OK, the Kerberos Distribution Center (KDC) uses its copy of the server s password to create a cryptographic hash of the unencrypted timestamp. The two hashes, one made by the server, one by the KDC, are compared. If they match, the server is authenticated because only the server and the DC have a copy of the server s password.

Disk Quotas can be implemented per-volume and per-user only. You cannot implement quotas on a per-folder or per-group basis.

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