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User: N/A Computer: savdaldc01savilltechnet Description: Kerberos pre-authentication failed Account Information: Security ID: Account Name: Service Information: Service Name: Network Information: Client Address: Client Port:
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Additional Information: Ticket Options: 0x40810010 Failure Code: 0x12 Pre-Authentication Type: 0 Certi cate Information: Certi cate Issuer Name: Certi cate Serial Number: Certi cate Thumbprint: Certi cate information is only provided if a certi cate was used for pre-authentication Pre-authentication types, ticket options and failure codes are de ned in RFC 4120 If the ticket was malformed or damaged during transit and could not be decrypted, then many elds in this event might not be present
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You might need to make a change to see these failure event logs Con gure this on the local computer policy of your domain controller or on all domain controllers via group policy, and set the Audit Account Logon Events setting under Computer Con guration, Windows Settings, Security Settings, Local Policies, Audit Policy to Success, Failure If an account is locked out, the option Unlock Account is available via the user s Account tab, as shown in Figure 4-45
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FIGURE 4-45 Unlocking a locked-out account By default, the information related to lockout information and good and bad logons is stored on each domain controller and not easily viewable across all domain controllers However, for Windows Server 2003, an additional account information DLL, acctinfodll, was available as part of the resource kit and when it was registered with command regsvr32 acctinfodll, a new tab for user objects displayed the following:
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The last time the password was set The domain password policies When the password will expire The lockout status The last good and bad logons
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Windows Server 2008 mode domains provide a much better way to track good and bad logons, as discussed in 12
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Windows Server 2008 has had a great deal of attention paid to its security and protection from attacks In addition to improvements to Windows Firewall, components enabled only when needed, and the other items discussed in this chapter, a lot of kernel-level changes have made it more dif cult to hack a system ( 2 covers many of these) One key bit of protection that is security focused is the addition of address space load randomization (ASLR) Before Windows Server 2008, the kernel, HAL, and key executables and DLLs were loaded at xed locations in memory This made it easier for a process to try to attack these memory areas In Windows Server 2008, these modules are placed in 1 of 256 random points in the address space, making it far more dif cult to attack A service can auto restart only 10 times, after which the server must reboot before the service can restart; this means an attacker can t try all 256 because the server will reboot So if you see a server rebooted because of service retry, check for hack attempts In this chapter, many of the security features are discussed at a high level, which is an unfortunate limitation when trying to cover such a huge topic As mentioned at the beginning of this chapter, many securityrelated technologies are discussed throughout the entire book; this chapter focuses on technologies that are purely security This chapter helps you see what is available and how to use the various features Security is often discussed but not emphasized enough in organizations Taking some time to understand the features that are available to you and spending some time now securing your environment will save you a lot of time later, when you re not hacked If you want to lock down your environment, download the Microsoft Windows Server 2008 Security Guide It has 200 pages of lockdown information, and it even includes some group policy templates and updates for the Security Con guration and Analysis snap-in
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