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Netlogon
Netlogon needs: Maintains a secure channel between this computer and the domain controller for authenticating users and services. If this service is stopped, the computer may not authenticate users and services, and the domain controller cannot register DNS records.”
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NTDS
Res1.logs Res2.log: This is reserved transaction log files of 20 MB (10 MB each) which provides the transaction log files enough room to shutdown if the other spaces are being used. Garbage Collection: is a process that is designed to free space within the Active Directory database. This process runs independently on every DC with a default lifetime interval of 12 hours. ★ Removing “tombstones” from the database. Tombstones are remains of objects that have been previously deleted. ★ Deletion of any unnecessary log files. ★ The process launches a defragmentation thread to claim additional free space. Online Defragmentation: method that runs as part of the garbage collection process. The…
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LDAP
The Lightweight Directory Access Protocol, or LDAP, is an application protocol for querying and modifying data using directory services running over TCP/IP port-389
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Active Directory Tips
1: Keep it simple The first bit of advice is to keep things as simple as you can. Active Directory is designed to be flexible, and if offers numerous types of objects and components. But just because you can use something doesn’t mean you should. Keeping your Active Directory as simple as possible will help improve overall efficiency, and it will make the troubleshooting process easier whenever problems arise. 2: Use the appropriate site topology Although there is definitely something to be said for simplicity, you shouldn’t shy away from creating more complex structures when it is appropriate. Larger networks will almost always require multiple Active Directory sites. The site…
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Trusted relationship error cause Part 1
The secure channel is used to validate the member servers or workstations membership in the domain, based upon its hashed password. This discrete communication channel helps provide a more secure communication path between the domain controller and the member servers or workstations. It can also be used to change the accounts password, and to retrieve domain-specific information, handling NTLM authentication pass-through to the domain controller, or from DC to DC for the same. When you join a computer to a domain, a computer account is created, and a password is shared between the computer and the domain. By default, this password is changed every 30 days. The secure channel’s password is…
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WMI filters
This article describes the following: What is WMI? Creating WMI filters Generate WMI code More than 30 GPO WMI filtering examples Testing WMI filters What is WMI? WMI is an uniform way to gain access to system or administrative information in a database-like kind of way. Most common syntax of a WMI query is: SELECT [property] from [wmi class] Creating WMI filters You create a WMI filter following the next steps: 1. Start Group Policy Management Console and connect to the domain. 2. Right click WMI Filters en choose New. 3. Enter a title and description for the filter and click Add. 4. Enter the query and click OK. 5. Repeat steps 3 and 4…
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GROUP POLICY SYSVOL
What is Sysvol? Sysvol is a special folder which is available in C:\Windows\SYSVOL directory in all domain controllers within the domain. This special folder contains the domain’s Group Policy settings, default profiles, and logon/logoff/startup/shutdown scripts. When a user login to a client machine, it pulls all the group policy settings and login scripts available at its local DC’s SYSVOL folder. For this reason, this folders keeps on replicating between each other either using DFS-R (Distributed File System Replication Service) or the primitive FRS (File Replication Service). Sysvol directory can be accessed using: \\domain-name\SYSVOL or\\DC-name\SYSVOL Contents of SYSVOL If you access the location C:\Windows\SYSVOL, you will see 4 folders – domain,…
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SYSVOL Folder Structure
About each folder under the SYSVOL share in Domain Controller SYSVOL folder used to store a copy of the domain’s public files like system policies, Group Policy settings and logon/logoff scripts, which are replicated to all other domain controllers in the Active Directory domain through File Replication Services (FRS), You can find many folders inside the SYSVOL share, I would like to explore and explain each folder by how it’s used in the process of SYSVOL replication.SYSVOL Folder Structure Sysvol |____| |____Policies| |____Scripts| |____ DO_NOT_REMOVE_NtFrs_PreInstall_Directory| |____ NtFrs_PreExisting___See EventLog ||____Enterprise| |____Policies| |____Scripts||____Staging| |____Domain| |____Enterprise||____Staging Areas| |____Enterprise (junction> = SysvolStagingEnterprise)| |____Your Domain Name (junction> = SysvolStagingDomain)| |____Sysvol| |____Enterprise (junction> = SysvolEnterprise)| |____Your Domain Name (junction>…
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To Reset the DSRM Administrator Password
Click Start, click Run, type ntdsutil, and then click OK. At the Ntdsutil command prompt, type set dsrm password. At the DSRM command prompt, type one of the following lines: To reset the password on the server on which you are working, type Reset password on server null. The null variable assumes that the DSRM password is being reset on the local computer. Type the new password when you are prompted. Note that no characters appear while you type the password. -or- To reset the password for another server, type reset password on servername, where servername is the DNS name for the server on which you are resetting the DSRM password. Type the new password when you are…
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AD Removing Lingering Objects
repadmin /removelingeringobjects DCSERVERNAME GUID of good working DC dc=xxxx,dc=xxxx The repadmin /removelingeringobjects command does the following: Compares the directory database objects on a reference domain controller with the objects on the target domain controller, which contains (or is suspected to contain) lingering objects.Either removes the lingering objects or logs the potential deletions to the Directory Service event log, as follows: • If you use the /advisory_mode parameter, events are logged in the Directory Service event log for the objects that are found. • If you do not use the /advisory_mode parameter, the found objects are deleted without replicating the deletions; that is, the deletions occur only on the target domain…