Labels

Thursday, August 6, 2009

Resetting Computer Account Passwords

I was trying to tell from a workstation point of view when the computer account password was last set. I'm sure this information is stored locally somewhere, but in the end it was easier to query the AD and find when the password for the computer account was last set.

This is used for Virtual Machine templates - we use nltest to reset the computer account password, such that we can maintain a single template image and turn it on periodically for updates without having to rejoin to the domain because of mismatched computer accounts.

Forcefully reset the computer account password:



nltest /SC_CHANGE_PWD:%domain%



Query the workstation in the domain and find when the password was last set - returns the number of 100 nanosecond intervals since 01/01/1601.



dsquery computer -name ws01
dsquery * "CN=ws01,OU=Computers,DC=domain,DC=com" -attr pwdlastset
pwdlastset
128934012123005000


Use PowerShell to convert the number to a human readable date format:



powershell [datetime]::FromFileTime(128934012123005000)

Thursday, 30 July 2009 2:20:12 PM


Use w32tm to convert the number to a human readable date format:



w32tm /ntte 128934012123005000

149229 04:20:12.3005000 - 30/07/2009 2:20:12 PM



Use VBScript to convert the number to a human readable date format:



cscript ConvertFileTime.vbs 128934012123005000

30/07/2009 2:20:12 PM


' ConvertFileTime.vbs
' VBScript doesn't support 64-bit integers, so it can't handle the number of 100 nanosecond intervals since 01/01/1601
' http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnclinic/html/scripting09102002.asp

' Either use ADSI provider and the IADs/IADsLargeInteger object
' LargeIntValue = objLargeInt.HighPart * 2^32 + objLargeInt.LowPart

' http://msdn.microsoft.com/library/default.asp?url=/library/en-us/adsi/adsi/iadslargeinteger.asp'
' Or WMI, which handles the conversion between 64-bit datetime structure / UTC / and VB var datetime

If Wscript.Arguments.UnNamed.Count > 0 Then 
        strDateTime = Wscript.Arguments.UnNamed(0)
        Set objDateTime = CreateObject("WbemScripting.SWbemDateTime")
        If IsDate(strDateTime) Then
                Call objDateTime.SetVarDate(strDateTime, False)
                wscript.echo objDateTime.GetFileTime
        Else
                Call objDateTime.SetFileTime(strDateTime, False)
                wscript.echo objDateTime.GetVarDate
        End If
        intReturn = 0
Else
        WScript.Echo "Specify a filetime or a date to convert, eg 127076450620627215, or ""11/04/2006 11:17:10 AM"""
        intReturn = 2
End If
WScript.Quit(intReturn)


Wayne's World of IT (WWoIT), Copyright 2009 Wayne Martin. 

No comments:


All Posts

printQueue AD objects for 2003 ClusterVirtualCenter Physical to VirtualVirtual 2003 MSCS Cluster in ESX VI3
Finding duplicate DNS recordsCommand-line automation – Echo and macrosCommand-line automation – set
Command-line automation - errorlevels and ifCommand-line automation - find and findstrBuilding blocks of command-line automation - FOR
Useful PowerShell command-line operationsMSCS 2003 Cluster Virtual Server ComponentsServer-side process for simple file access
OpsMgr 2007 performance script - VMware datastores...Enumerating URLs in Internet ExplorerNTLM Trusts between 2003 and NT4
2003 Servers with Hibernation enabledReading Shortcuts with PowerShell and VBSModifying DLL Resources
Automatically mapping printersSimple string encryption with PowerShellUseful NTFS and security command-line operations
Useful Windows Printer command-line operationsUseful Windows MSCS Cluster command-line operation...Useful VMware ESX and VC command-line operations
Useful general command-line operationsUseful DNS, DHCP and WINS command-line operationsUseful Active Directory command-line operations
Useful command-linesCreating secedit templates with PowerShellFixing Permissions with NTFS intra-volume moves
Converting filetime with vbs and PowerShellDifference between bat and cmdReplica Domain for Authentication
Troubleshooting Windows PrintingRenaming a user account in ADOpsMgr 2007 Reports - Sorting, Filtering, Charting...
WMIC XSL CSV output formattingEnumerating File Server ResourcesWMIC Custom Alias and Format
AD site discoveryPassing Parameters between OpsMgr and SSRSAnalyzing Windows Kernel Dumps
Process list with command-line argumentsOpsMgr 2007 Customized Reporting - SQL QueriesPreventing accidental NTFS data moves
FSRM and NTFS Quotas in 2003 R2PowerShell Deleting NTFS Alternate Data StreamsNTFS links - reparse, symbolic, hard, junction
IE Warnings when files are executedPowerShell Low-level keyboard hookCross-forest authentication and GP processing
Deleting Invalid SMS 2003 Distribution PointsCross-forest authentication and site synchronizati...Determining AD attribute replication
AD Security vs Distribution GroupsTroubleshooting cross-forest trust secure channels...RIS cross-domain access
Large SMS Web Reports return Error 500Troubleshooting SMS 2003 MP and SLPRemotely determine physical memory
VMware SDK with PowershellSpinning Excel Pie ChartPoke-Info PowerShell script
Reading web content with PowerShellAutomated Cluster File Security and PurgingManaging printers at the command-line
File System Filters and minifiltersOpsMgr 2007 SSRS Reports using SQL 2005 XMLAccess Based Enumeration in 2003 and MSCS
Find VM snapshots in ESX/VCComparing MSCS/VMware/DFS File & PrintModifying Exchange mailbox permissions
Nested 'for /f' catch-allPowerShell FindFirstFileW bypassing MAX_PATHRunning PowerSell Scripts from ASP.Net
Binary <-> Hex String files with PowershellOpsMgr 2007 Current Performance InstancesImpersonating a user without passwords
Running a process in the secure winlogon desktopShadow an XP Terminal Services sessionFind where a user is logged on from
Active Directory _msdcs DNS zonesUnlocking XP/2003 without passwords2003 Cluster-enabled scheduled tasks
Purging aged files from the filesystemFinding customised ADM templates in ADDomain local security groups for cross-forest secu...
Account Management eventlog auditingVMware cluster/Virtual Center StatisticsRunning scheduled tasks as a non-administrator
Audit Windows 2003 print server usageActive Directory DiagnosticsViewing NTFS information with nfi and diskedit
Performance Tuning for 2003 File ServersChecking ESX/VC VMs for snapshotsShowing non-persistent devices in device manager
Implementing an MSCS 2003 server clusterFinding users on a subnetWMI filter for subnet filtered Group Policy
Testing DNS records for scavengingRefreshing Computer Account AD Group MembershipTesting Network Ports from Windows
Using Recovery Console with RISPAE Boot.ini Switch for DEP or 4GB+ memoryUsing 32-bit COM objects on x64 platforms
Active Directory Organizational Unit (OU) DesignTroubleshooting computer accounts in an Active Dir...260+ character MAX_PATH limitations in filenames
Create or modify a security template for NTFS perm...Find where a user is connecting from through WMISDDL syntax in secedit security templates

About Me

I’ve worked in IT for over 13 years, and I know just about enough to realise that I don’t know very much.