Windows PowerShell Syntax

> To list all the PowerShell commands available for group policy module:

Get-Command -module GroupPolicy

or

Get-Command *-GP*
 

> To list all the PowerShell commands available for active directory module:

Get-Command -module activedirectory

or

Get-Command *-AD*

 

> For more detail information about certain PowerShell commands:
 

Get-Help (commandname) -detailed

Get-Help (commandname) - examples

Get-Help (commandname) -full

or

Get-help (commandname) -online

 

MBSA Cabinet File Download Location

If you want to manually download the cabinet file for Microsoft Baseline Security Analyzer (MBSA) v2.2, here's the url:

http://go.microsoft.com/fwlink/?LinkId=76054

The name of the file is WSUSSCN2.CAB

Using SMTP for Active Directory Replication

SMTP replication is used only for replication between sites.
You also cannot use SMTP replication to replicate between domain controllers in the same domain—only inter-domain replication is supported over SMTP (that is, SMTP can be used only for inter-site, inter-domain replication).
SMTP replication can be used only for schema, configuration, and global catalog partial replica replication. SMTP replication observes the automatically generated replication schedule.

DNS Tombstones in Windows 2003 and 2008

When DNS records are deleted from AD integrated zones, they are not immediately tombstoned in the way normal AD object deletions are. Instead, they go through a DNS tombstone process. This includes setting dnsTombstoned=True for the object.

When set to True, the DNS console and tools will ignore the presence of the record. You will still see the objects through LDP/ADSIEDIT/LDIFDE alongside the other DNS records. Each DNS server is hard coded to perform a cleanup process every morning at 2 a.m. to delete any dnsTombstoned=True records that are seven days old or older.

It is at this time that the objects are tombstoned like normal AD deletions (isDeleted=True) and moved to the Deleted Objects container. This is important to know in case someone deletes records, such as enabling scavenging for the first time, and wants to know why they still see the objects in Active Directory. The reason for the seven days of dnsTombstoned=True is to prevent frequent database churn. This is because workstation records may get de-registered or scavenged and then re-created within a short period of time.

Prevent Registration of Certain Domain Controller DNS Records

There are times when you want to restrict a Domain Controller from registering certain resource records in the DNS. One of the scenario is when you have hub - spoke topology, it is preferable that if all domain controllers/global catalogs in a satellite site become unavailable, a client that is searching for a domain controller/global catalog in that site will fail over to a domain controller/global catalog in a central hub and not in another satellite site.
To achieve this behavior, the domain controllers/global catalogs in the satellite offices should not register generic (non-site-specific) domain controller locator DNS records

To restrict the DNS resource records that are updated by NetlLogon

1. Open Registry Editor.
2. In Registry Editor, navigate to the following registry key:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Netlogon\Parameters
3. Add the following multistring value (REG_MULTI_SZ) value:
   DnsAvoidRegisterRecords
4. In this value, specify the list of data corresponding to the DNS resource records that should not be registered for this domain controller by the Net Logon service. The following table contains the list of data.

<>

<>

Domain Controller -Specific Records

Mnemonic	Type	DNS Record
LdapIpAddress	A
Ldap	SRV	_ldap._tcp.
DcByGuid	SRV	_ldap._tcp..domains._msdcs.
Kdc	SRV	_kerberos._tcp.dc._msdcs.
Dc	SRV	_ldap._tcp.dc._msdcs.
Rfc1510Kdc	SRV	_kerberos._tcp.
Rfc1510UdpKdc	SRV	_kerberos._udp.
Rfc1510Kpwd	SRV	_kpasswd._tcp.
Rfc1510UdpKpwd	SRV	_kpasswd._udp.

Global Catalog-Specific Records

Mnemonic	Type	DNS Record
Gc	SRV	_ldap._tcp.gc._msdcs.
GcIpAddress	A	gc._msdcs.
GenericGc	SRV	_gc._tcp.