Checksum Error On A Database Page Ntds
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for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job jet_errreadverifyfailure checksum error on a database page Ways to Get Help Expand Search Submit Close Search Login Join Today Products BackProducts firebird checksum error on database page Gigs Live Careers Vendor Services Groups Website Testing Store Headlines Experts Exchange > Questions > Repair NTDS.DIT that have bad 1018 there is a checksum error on a database page checksum Want to Advertise Here? Solved Repair NTDS.DIT that have bad checksum Posted on 2013-02-26 SBS Windows Server 2008 Active Directory 1 Verified Solution 10 Comments 2,846 Views Last Modified: 2013-09-25 Hi, yes i the replication operation encountered a database error 8451 know, i should have done backup of AD to, but i didnt :-( My ntds.dit file is corrupted and i dont have backup. Its a SBS 2011 premium server I can start in directory recover mode I can't start in safe mode or normal mode :-( First time i tried to run ntdsutil and the file command it failed, i couldnt run it. I had to run the
Ntds.dit Repair
go fix command and after that i can run the file command. But i cant fix the bad checksum so i cant start it in normal mode. Is there any way to repair the ntds.dit file in any way, some program or other way to do it? Is it possible to see what the checksum should be and correct it manualy? If its not possible to fix the ntds.dit file, is it possible to start AD on scratch and connect it to the exchange server? 0 Question by:per-w Facebook Twitter LinkedIn Google LVL 5 Best Solution byvin_shooter I think then its not possible to revert the situation. Have to demote the DC and have to start right from scratch.., I doubt. Go to Solution 10 Comments LVL 9 Overall: Level 9 Active Directory 9 Windows Server 2008 6 SBS 1 Message Expert Comment by:Zenvenky2013-02-26 Yes, you can repair NTDS.dit. As this is SBS server, I'm sure you do not have any other DC in the domain. Now that you are in DSRM mode, check the NTDS paths in registry and default folder where it is suppose to be. Use the following link though it doesn't mention SBS, you can use this KB
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Ntdsutil File Integrity
Windows Server > Directory Services General discussion 5 Sign in to vote It ntdsutil semantic database analysis worked for me! Frank Keunen IT-Pro Evangelist :: Microsoft IT Infrastructure Engineer Follow the procedure below to fix Microsoft Active esentutl /k 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. 2. Check the physical location https://www.experts-exchange.com/questions/28045541/Repair-NTDS-DIT-that-have-bad-checksum.html 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 Control Everyone – Read NTFS Permissions: —————– 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 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 – 10.1 Mb Backup dir: C:\WINNT\NTDS\dsadata.bak Working dir: C:\WINNT\NTDS Log dir : C:\WINNT\NTDS – 30.0
may have a replication issue so I started looking into it and to give a brief background of the environment.. we have almost 48 Windows 2008 R2 domain controllers globally, so we needed to find out where http://asknicks.blogspot.com/2013/05/active-directory-database-corruption.html and how the replication is broken.. Now, i needed a tool that can go and http://eniackb.blogspot.com/2009/06/active-directory-database.html 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 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 checksum error and unfortunately i found one of our DCs hasn't replicated in last 16 hrs (quite worrying, huh!! ). But just next to it 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 checksum error on 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 Drivers/firmware especially disk controller & controller cache. Sudden power loss Lingering objects Time to fix it then.. most of the time the Domain Administrators prefer to go ahead and rebuild the domain controller and sync everything back, but the real concern is how many changes does this box hold and what would be the impact if we go ahead with demote andre promoteof the server.. hmm, so in our case we decided to go a bitfurtherand look for clues to fix the issue instead of going for a demotion.... So, the question was how can we find more details about the error.. and lik
that at startup is showing a message "Directory is Rebuilding Indices" and after a long time it fails?Did you found corruption messages in event log:NTDS ISAM Event ID: 467 database corruption Error,NTDS Replication Event ID: 1084 Replication ErrorNTDS Replication Event ID: 2108 Replication ErrorNTDS General Internal Event ID: 1173 Processing Warning………………………………………………….and others...What about descriptions:- 8451 The replication operation encountered a database error.-1414 JET_errSecondaryIndexCorrupted, Secondary index is corrupt. The database must be defragmentedYep, these are some of the corruption errors that you may find if your Active Directory (AD) Database (DB) is "dead"1 - Before proceed, let me tell you that in scenarios like this one, you should always try to get the best help possible. Best help means calling to Microsoft PSS. They have the necessary experience and documentation to help you with those problems.2 - The recovery solutions posted bellow does not guarantee that your problem will be fixed. The posted solutions are general recommendations that you may decide to follow or not. Use the information on this post at your own RISK!!! And remember to ALWAYS test in lab environments before going to production.That said what options do I have when this happens?Note: You should always try to find the root cause for these types of problems. The root problems are normally related with hardware problems, antivirus configurations, Virus, Power outages, etc... If you don't identify the root cause, there's a good probability that you may end up where you started.Now it's time to recover...******************************************************************Scenario 1: Recover From Backup *******************************************************************************