Ntds.dit Checksum Error
Contents |
(עברית)المملكة العربية السعودية (العربية)ไทย (ไทย)대한민국 (한국어)中华人民共和国 (中文)台灣 (中文)日本 (日本語) HomeWindows 10Windows 10 MobilePrevious versionsMDOPSurfaceSurface HubLibraryForums Ask a question Quick access Forums home Browse forums users FAQ Search related threads Remove From My Forums Asked by: Fix: Active directory corrupted (NTDS ISAM Database Corruption errors
Ntds.dit Repair
in eventlog) Windows Server > Directory Services General discussion 5 Sign in repair corrupt active directory database to vote It worked for me! Frank Keunen IT-Pro Evangelist :: Microsoft IT Infrastructure Engineer Follow the procedure below
Esentutl /repair
to fix Microsoft Active Directory database problems (corrupted Active Directory due to e.g memory issues/disk problems): 1. Reboot the server and press F8. Choose Directory Services Restore Mode from the Menu. ntdsutil repair active directory 2. Check the physical location of the Winnt\NTDS\ folder. 3. Check the permissions on the \Winnt\NTDS folder. The default permissions are: Administrators – Full Control System – Full Control 4. Check the Winnt\Sysvol\Sysvol folder to make sure it is shared. 5. Check the permissions on the Winnt\Sysvol\Sysvol share. The default permissions are: Share Permissions: —————— Administrators – Full Control Authenticated Users – Full integrity check completed. database is corrupted Control Everyone – Read NTFS Permissions: —————– Administrators – Full Control Authenticated Users – Read & Execute, List Folder Contents, Read Creator Owner – none Server Operators – Read & Execute, List Folder Contents, Read System – Full Control Note: You may not be able to change the permissions on these folders if the Active Directory database is unavailable because it is damaged, however it is best to know if the permissions are set correctly before you start the recovery process, as it may not be the database that is the problem. 6. Make sure there is a folder in the Sysvol share labeled with the correct name for their domain. 7. Open a command prompt and run NTDSUTIL to verify the paths for the NTDS.dit file. These should match the physical structure from Step 2. To check the file paths type the following commands: Start a command prompt NTDSUTIL Files Info The output should look similar to: Drive Information: C:\ NTFS (Fixed Drive) free (2.9 Gb) total (3.9 Gb) D:\ NTFS (Fixed Drive) free (3.6 Gb) total (3.9 Gb) DS Path Information: Database : C:\WINNT\NTDS\ntds.dit
may have a replication issue so I started looking into it and to give a brief background of the environment..
Ntds Isam 467
we have almost 48 Windows 2008 R2 domain controllers globally, so failed to open dit for ad ds lds we needed to find out where and how the replication is broken.. Now, i needed a tool that
Ntdsutil Active Instance Not Set
can go and check all domain controllers to summarize the replication inbound and outbound replication status.. so Ipulled up "REPADMIN"to find out the inbound and outbound replication status https://social.technet.microsoft.com/Forums/windows/en-US/172eb4bb-a8df-42ce-a1c7-472d33dc210a/fix-active-directory-corrupted-ntds-isam-database-corruption-errors-in-eventlog?forum=winserverDS of my domain.. I ran "repadmin /replsummary" and i started counting dots on the command screen which represent the progress. So after few minutes of processing, I had a summary report of the servers and unfortunately i found one of our DCs hasn't replicated in last 16 hrs (quite worrying, huh!! ). But just next to it http://asknicks.blogspot.com/2013/05/active-directory-database-corruption.html had a reason of the failure which said "The replication operation encountered a database error" Oopps, this is getting interesting now.. So, i logged in to the Domain Controller reporting database issue to investigate further and fix it. The directory service Event log showed me Database index corruption errors.. hmm interesting.. Log Name: Directory Service Source: NTDS ISAM Date: 10.5.2013 10:03:21 Event ID: 467 Task Category: Database Corruption Level: Error Keywords: Classic User: N/A Computer: Test.domain.local Description: NTDS (492) NTDSA: Database C:\Windows\NTDS\ntds.dit: Index DRA_USN_index of table datatable is corrupted (0). Corrupt database? This willdefinitelyskip a heartbeat of most of the AD administrators.. :( so we ran little PowerShell script to quickly check all domain controllers for Event ID 467 and make sure we are not spreading the corruption over to other servers. Thankfully no other DC isexperiencingthe corruption.. Generally, the corruption can be caused by numerous reasons but i had few in my mind that requires a check there and then... Hardware Outdated Dr
Azure Canyoning Cisco Collaboration and workspace Computers and Internet Core Server Databases Deployments Development https://itworldjd.wordpress.com/2014/03/17/how-to-check-ad-database-integrity/ Exchange Ldap Licensing Microsoft Monitoring Office Office365 Openldap Patch Management Powershell http://www.winvistatips.com/threads/ad-repair-possible-event-id-474s.667180/ Quest ARS Real-time collaboration and UM Security Sharepoint SQL Server Storage Supervision Sysinternals System and Network Admins Terminal Services Uncategorized Unix-Linux VBScript Virtualization Volume Activation Web server Windows Server/Client How to check AD databaseintegrity? Filed under: Active Directory March 17, 2014 How to active directory check AD database integrity? Here are best practices to check your AD database (on Windows Server 2008 R2 or greater) for any errors and attempt to fix (some of) them. Note: Running this before creating an IFM media set is highly recommended since it will identify AD database errors. First stop the "Active Directory ntds.dit checksum error Domain Services" service and related services (intersite messaging, dfs replication, kdc) Write-Output "Checking the NTDS database for errors (semantic database analysis) `r " Stop-Service ntds -force #The following command verifies the "checksum" of the database: PS C:\> ntdsutil C:\Windows\system32\ntdsutil.exe: activate instance ntds Active instance set to "ntds". C:\Windows\system32\ntdsutil.exe: files file maintenance: checksum Doing checksum validation for db: D:\NTDS\ntds.dit. File: D:\NTDS\ntds.dit Checksum Status (% complete) 0 10 20 30 40 50 60 70 80 90 100 |---|---|---|---|---|---|---|---|---|---| …………………………………………… 3074 pages seen. 0 bad checksums. 0 correctable checksums 905 uninitialized pages. 0 wrong page numbers. […] #There is another command that checks the "integrity" of the database. But first, Microsoft documentation states that before running the integrity command (below) #we should run the "ntdsutil files recover" command. This commands "ensures all committed transactions […] are reflected in the data file." #Since we are still in "ntdsutil, files" , we can simply enter the command as follows: file maintenance: recover Initiating RECOVERY mode… Log files:
Error Event Source: NTDS ISAM Event Category: Database Page Cache Event ID: 474 Date: 7/16/2008 Time: 6:51:41 AM User: N/A Computer: SERVER1 Description: NTDS (636) NTDSA: The database page read from the file "C:\WINDOWS\NTDS\ntds.dit" at offset 19144704 (0x0000000001242000) for 8192 (0x00002000) bytes failed verification due to a page checksum mismatch. The expected checksum was 3869564695 (0xe6a4df17) and the actual checksum was 3321945879 (0xc600df17). The read operation will fail with error -1018 (0xfffffc06). If this condition persists then please restore the database from a previous backup. This problem is likely due to faulty hardware. Please contact your hardware vendor for further assistance diagnosing the problem. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. --------------- Currently, with the exception of all of these errors, everything seems fine. I believe this was caused by a power outage where the UPS shutdown the system and (maybe) the delay wasn't long enough to let SBS 2003 R2 shutdown gracefully. I can open AD Users & Computers and everything seems to be there (we only have 6 users and 7 computers including the server). I can also open AD sites, AD trusts. Exchange Manager also seems fine. Our most recent backup of system state was 6/27/08, but it apparently did not complete successfully. Previous successful system state backup is months old. Via Google I have seen reference to NTDSUtil and ESENTUTL, but wanted to ask here before trying anything like that. If I'm not mistaken I have to reboot to do those and I always hesitate to reboot a working system when things are working. Thanks in advance. R, Jul 16, 2008 #1 Advertisements Miles Li [MSFT] Guest Hello, Thank you for your post. Please allow me to confirm that my understandings are correct. As I understand it, the issue is: You receive the Active Directory database ntds.dit checksum mismatch error (Event ID 474) on the Windows SBS 2003 server. However, everything (ADUC, Exchange server) seems to work correctly without any problem. You have a months old backup and have a concern if a database Check/recovery with reboot is necessary. If I have misunderstood your concerns please feel free to let me know. Explanation : ============== Typically, this issue general results from the 2 reasons (Hard disk error and Active Directory database erro