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Managing Network Security
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6. On the Security Methods page, select a security method and click Edit. 7. Click Custom and click Edit; then click Settings. 8. Change the Encryption algorithm from 3DES to DES. 9. Click OK twice, and then select any remaining security methods (Figure 11-41) and change their encryption algorithms from 3DES to DES. Click OK twice.
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Figure 11-41
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10. Click OK twice. Then click Close and then OK to save the policy changes. 11. Assign the telnet policy on both computers. This policy worked previously, but you have just made a change. 12. Attempt to telnet from Computer2 to Computer1. Does it work
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13. In the IP Security Management console, open the IP Security Monitor snap-in for Computer1 and select the Active Policy node. What is the Active Policy and when was it modified 14. The Active Policy should be your telnet policy. If it is not, you might have already found the problem. Go back and review the previous part of this section of the exercise. Write down the time; in the production environment, you should always document when IPSec policies have changed. By comparing that date to the one
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Troubleshooting Network Protocol Security 11-77
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in the interface, you might discover an unauthorized change has been made. Although that might explain why a problem exists, it doesn t resolve it. 15. Examine the IP Security Monitor snap-in for Computer2 and select the Active Policy node. What is the active policy and when was it last changed
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16. Open both monitors to the Main Mode, Statistics node and examine the details pane. Do you find any failures
17. Open both monitors to the Quick Mode, Statistics node and examine the parame ters Key Additions, Key Deletions, and Rekeys. What do you find
18. Unassign the changed policy and fix it. (Change the encryption type back to 3DES.) 19. Assign the policy and then stop and start the IPSec service. What does IPSec Monitor show now
20. Unassign policies on both computers.
Practice 2: Troubleshoot Logon Issues with Network Monitor
You often want to determine which authentication protocol is in use so you can determine why some users are having trouble accessing resources. It is also an issue when you want to consider what visitors can access if they are allowed to plug into your network, or in order to plan security for the LAN Manager protocol. In this exercise, you troubleshoot these kinds of issues. 1. On Computer2, delete any mapped drives or other connections to Computer1. 2. Log off Computer2. 3. Unplug the network connection. If the computer is not plugged into the network, it cannot obtain Kerberos tickets; however, users who have previously authenticated to the domain will be able to log on. Even so, they will not be able to use Kerberos. 4. From Computer1, log on to the domain.
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Managing Network Security
5. Start Kerbtray and note that there are no Kerberos tickets. 6. Reconnect the network connection. 7. Start a Network Monitor capture on Computer1. 8. Map to the capture share on Computer1. You should use the name of the com puter in the path, in other words, \\Computer1\Capture. 9. From the Capture menu of Network Monitor, select Stop And View and answer the following questions. Were you successful
How can you tell
10. For confirmation, check the network capture. You should be able to locate an SMB negotiate frame (Figure 11-42), which indicates NTLM was used. Record the time the frame was recorded. (In the test done for these exercises, the time was 8:24.)
Figure 11-42
Finding NTLM negotiate in the Network Monitor capture
Practice 3: Use Event Logs for Troubleshooting
In the previous two exercises, you modified an IPSec policy and examined its behavior in IPSec Monitor. You also used Network Monitor to examine packets that indicated that Kerberos was not used for authentication. In this exercise, you examine the Event
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