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the connection rather than your policy, and you would like to know whether the policy is working overtime. You can use two tools to verify this information:

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Windows Server 2003, Windows 2000, and Windows XP Professional all use Kerberos for authentication in a Windows Server 2003 or Windows 2000 domain. However, if Kerberos cannot be used, authentication might fall back to NTLM, or if the domain controller is not available, logon from cached credentials is used instead. Also, when drives are mapped using server IP address instead of computer name, NTLM is used for authentication. In a large enough domain, every day, somewhere, Kerberos is probably not being used. You cannot turn off NTLM. You cannot somehow insist that only Kerberos be used in the domain. You can, however, make it easier for Kerberos to be used, and you can monitor and determine whether, in a specific instance, Kerberos was used for authen tication. First, inspect the Event logs looking for Kerberos errors. One common error has to do with computer clock skew time that is, if the difference between the client computer s clock and the domain controller is off by more than 5 minutes, Kerberos fails and you will find Kerberos errors in the event log. Although the time service running on clients attempts to keep the client synchronized with the DC, if the time difference is over 30 minutes, synchronization will not occur. Other errors might indicate network problems. Security Event log logon records indicate the protocol used. Examining logon events helps you determine which authentication protocol was used. You can also determine the authentication protocol from a Network Monitor capture.

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Perhaps one of the hardest aspects of networking to troubleshoot is IPSec. The best troubleshooting tool is your knowledge of how IPSec works, the specifics of your pol icies (what you are trying to accomplish and how the policy is configured), and the use of the IPSec Monitor.

ISALOG_yyyymmdd_FWS_nnn.iis This file type refers to logs stored in the ISA Server file format. In this format, yyyy represents the year, mm represents the month, dd represents the day, and nnn represents multiple log files created on the same day.

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1. Verify that auditing is turned on for Logon Events, Account Logon Events, and Policy Change Events.

Note If you use text logs to store all the ISA Server logs, you will see three current logs. In the log file names, FWS refers to the Firewall service, WEB refers to the Web proxy service, and EML refers to the SMTP Message Screener.

Troubleshooting Network Protocol Security 11-75

To view a log file stored in the MSDE format, complete the following steps: 1. In the ISA Server Management Console, click Monitoring. 2. Click the Logging tab. 3. To view the information being logged at the current time, click Start Query. When you choose this option, you are viewing the client connections in real time, so all the current client connection attempts are displayed in the logging window. 4. To limit which client connections are displayed in the log or to look at the archived log, click Edit Filter. You can apply a filter to the logged information based on any of the log fields. For example, you can filter the log based on Client IP, Log Record Type, Object Source, HTTP Method, and so on. You can also filter the log based on the log time, as shown in Figure 11-13. Use this option to view the archived logs.

2. On Computer1, create a new MMC and use the Add/Remove snap-in to add two occurrences of the Group Policy Object Editor snap-in: the first for the Default Domain Policy, and the second for the Default Domain Controllers Policy. 3. Save this console with the name Domain GPOs. 4. Expand the Default Domain Controllers Policy, expand Computer Configuration, expand Windows Settings, expand Security Settings, expand Local Policies, and then click Audit Policy. Note that auditing is turned on for account logon events, account management, and object access. 5. Examine the Audit Policy for the Default Domain Policy. Then answer the follow ing question. 6. Are these policies defined

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