Posts filed under ‘Windows’

SYSVOL Replication Error on Windows 2012 R2

Hi Guys

Recently we migrated  one of our customer’s  active directory domain controllers to a virtualized environment. During the DC migration  my colleague noticed that the SYSVOL and NETLOGON folders are not replicating it’s contents from the existing domain controller. Thus he copied the contents manually. But after some time client started reporting error like;

  • The Group Policy is not getting updated or Propagated to all the workstations / users.
  • Logon Scripts stopped working.

Thus when we digged in to the problem we were able to track down the issue to DFSR based sysvol replication, Most importantly the old DC was not replicating for almost 1300 days approximately(Figure.1) The below event ID’s helped us to track down the issue:

So when we started troubleshoot we tried to ran the commands stated in the Eventviewer(refer attached file) but no avail.

Also we ran the below command

For /f %i IN (‘dsquery server -o rdn’) do @echo %i && @wmic /node:”%i” /namespace:\\root\microsoftdfs path dfsrreplicatedfolderinfo WHERE replicatedfoldername=’SYSVOL share’ get replicationgroupname,replicatedfoldername,state

(In case if you ran in to an error when running the above command it could be due to the ‘ is get changed to ` when copying and pasting it. Thus change it manually)

Strangely the status on all the server showing 2 which is Initial Sync. (One of the reason for the problem) .Also in our MaxOfflineTimeInDays more than 1000 days. But
By default in Windows the  is set to 60 Days. In our case we need to extend it upto 1800 days where there was an offset of more than 1000. so we ran the command to force the servers to allow the content freshness for more than 1000 days.

wmic.exe /namespace:\\root\microsoftdfs path DfsrMachineConfig set MaxOfflineTimeInDays=1800

(Do not forget to bring it back the original value of 60 Days)

But sill no avail. Then we decided to Authoritative restore of the SYSVOL folders. We ran the below command set which were extracted from the MS KB:

Do this step on the PDC Emulator Role

Stop the DFSR Service

#net stop dfsr

Open the ADSIEDIT.MSC tool, connect to the “Default Naming Context” and move to OU=Domain Controllers” and select the PDC Emulator –> CN=SYSVOL Subscription,. Right click on  CN=Domain System Volume  and go to Properties(preferably the PDC Emulator, which is usually the most up to date for SYSVOL contents): and modify the following DN and two attributes 


Modify the following DN and single attribute on all other domain controllers in that domain:(Using the same path as mentioned above)


Stop the DFSR service on all the remaining controllers

#net stop dfsr

Force Active Directory replication throughout the domain and validate its success on all DCs.

#repadmin /syncall /AdP

Start the DFSR service set as authoritative:(On the PDC emulator)

#net start dfsr

You will see Event ID 4114 in the DFSR event log indicating SYSVOL is no longer being replicated.

On the same DN from Step 1, set:


Run the below command to force Active Directory replication throughout the domain and validate its success on all DCs.

#repadmin /syncall /AdP

Run the following command from an elevated command prompt on the same server that you set as authoritative:(In order to run the below command you need to install the “DFS Management Feature” on the servers , not the DFS Role)


You will see Event ID 4602 in the DFSR event log indicating SYSVOL has been initialized. That domain controller has now done a “D4” of SYSVOL.

Start the DFSR service on the other non-authoritative DCs.

#net start dfsr

You will see Event ID 4114 in the DFSR event log indicating SYSVOL is no longer being replicated on each of them.

Revert the the following DN  attribute as it was , on all other domain controllers in that domain.


Run the following command from an elevated command prompt on all non-authoritative DCs (i.e. all but the formerly authoritative one):



Voila we could see the replication started working and when we checked the replication status  via the command

For /f %i IN (‘dsquery server -o rdn’) do @echo %i && @wmic /node:”%i” /namespace:\\root\microsoftdfs path dfsrreplicatedfolderinfo WHERE replicatedfoldername=’SYSVOL share’ get replicationgroupname,replicatedfoldername,state 

(In case if you ran in to an error when running the above command it could be due to the ‘ is get changed to ` when copying and pasting it. Thus change it manually)


dfsrmig /getglobalstate

it shows  the status 4 (which is all synced)

I am listing the below articles which helped me in the initial troubleshooting.

Good Luck


Update 1 (29/01/2018) :

  • Added the start and stop DFSR commands.

November 5, 2017 at 12:19 pm 4 comments

Windows 2016 License Calculator


With recent change of Licensing approach by Microsoft to transient from Processor based to Core based license has triggered various confusions for customers.  But the HP has come up with a cool calculator that helps to calculate the exact licenses we need to procure per server  and the total rights for virtual OSE’s. Further this tool gives an option to add the number of VM’s that we are planning to host and in turn the tool gives the additional license pack we need to order;

June 12, 2017 at 12:51 pm Leave a comment

How to import Users to Windows 2012 Active Directory using PowerShell

Hi Guys

In many AD installations I do come across requirements  to create multiple users in Active Directory(More than 200 in many cases) .In these cases we could use the below mentioned CSV template and use the PS command to directly import the users in  to Active Directory.


Here the Path value is pointing to the OU that you want to place the users  in the Active Directory , which could be find using the Attribute Editor of the OU(We need to enable the Advance Feature in the ADUC Management Console)

PS Command Syntax
Import-CSV C:\anyname.csv | New-ADUser –AccountPassword (ConvertTo-SecureString –AsPlaintext “any complex password” –Force) –PassThru | Enable-ADAccount.


Import-CSV C:\Users_1.csv | New-ADUser –AccountPassword (ConvertTo-SecureString –AsPlaintext “P@ssw0rd” –Force) –PassThru | Enable-ADAccount



I am including here another method to achieve the same.

# Prepare the CSV file as per below(You could any details as much as you want, by adding the correct attribute.)


# Then run the below powershell.

+ You must change the active directory domain name.

+ You must change the csv file name.

+ Ensure that , you have given the proper DN namespace for the OU Value. Otherwise , the script will fail with the below error messages:

“No superior reference has been configured for the directory”

“New-ADUser : The object name has bad syntax”



# Import active directory module for running AD cmdlets
Import-Module activedirectory

#Store the data from ADUsers.csv in the $ADUsers variable
$ADUsers = Import-csv C:\test.csv

#Loop through each row containing user details in the CSV file
foreach ($User in $ADUsers)
#Read user data from each field in each row and assign the data to a variable as below

$Username = $User.username
$Password = $User.password
$Firstname = $User.firstname
$Lastname = $User.lastname
$OU = $User.ou #This field refers to the OU the user account is to be created in
$email = $
$telephone = $User.Mobile
$jobtitle = $User.jobtitle
$company = $
$department = $User.department
$Password = $User.Password

#Check to see if the user already exists in AD
if (Get-ADUser -F {SamAccountName -eq $Username})
#If user does exist, give a warning
Write-Warning “A user account with username $Username already exist in Active Directory.”
#User does not exist then proceed to create the new user account

#Account will be created in the OU provided by the $OU variable read from the CSV file
New-ADUser `
-SamAccountName $Username `
-UserPrincipalName “$” `
-GivenName $Firstname `
-Surname $Lastname `
-Name “$Firstname $Lastname” `
-DisplayName “$Lastname, $Firstname” `
-Enabled $True `
-Path $OU `
-Company $company `
-EmailAddress $email `
-Mobile $telephone `
-Title $jobtitle `
-Description $jobtitle `
-Department $department `
-AccountPassword (convertto-securestring $Password -AsPlainText -Force) -ChangePasswordAtLogon $True



December 22, 2016 at 2:24 pm Leave a comment

There is no certificates installed on this remote desktop server

On the RD  Session Host Configuration when you tried to assign the SSL certificate which you obtained from any vendor you will receive the message in the title.

This is because the SSL certificate need to be imported on .PFX format , In my case the cert i downloaded from GoDaddy was having a .crt extension. Therefore I opened the Certificate-Snapin(Local Computer) and  selected the already imported certificate in the Personal container,then I  tried to export the certificate as  Personal Information Exchange(.pfx)so I could re-import it correctly But I was not able to do so as it was showing the below screen,


As you see the Personal Information Exchange option is disabled as this is because the SSL certificate does not have the private key.

In order to overcome this get the serial number of the certificate(Open  the ssl certificate by double clicking on it and open the details TAB) then on a command prompt entere the below command;

certutil -repairstore my “SerialNumber”

That’s it now you could the export the cert as .pfx and re-import it on Personal and Remote Desktop containers in Certificate Snap-in.

Finally you could select the SSL on RD Session Host configuration.




In 2012 and above MS have removed the RDP Snap-in to change the SSL Certificate thus you need to follow the steps mentioned in MS KB Article:


May 25, 2015 at 2:27 pm Leave a comment

Trust relationship cannot be created because the following error occurred


I was trying to build a Forest wide Trust between 2003 R2 and 2008 R2 environment and I covered  the required prerequisites as below;

* The forest functional level should be  set to minimum  Windows 2003 Server(On the Windows 2003 Domain Controller)

* The conditional forwarding  was set up on 2003  and 2008 to resolve target domain names

But still I was getting  the error on the title along with the below error ;

“The operation failed: The error is: This operation cannot be performed on the current domain.”



In order to solve this please make sure below identifiers are not same in your both target and source domains


– NetBIOS  name

– DNS name

In my case it was the NetBIOS name and I had to rename the domain name.


Known Issues for Creating Domain and Forest Trusts
Available From: Accessed (12th May 2015)


May 12, 2015 at 1:45 pm Leave a comment

How to restore Active Directory Users with Active Directory Recycle bin

Dear Folks

I would strongly recommend to enable this feature to ease up the administration, further If you have deployed Exchange in your environment and if you want to recover a deleted mailbox the AD Recycle bin becomes handy because when you delete the Mailbox on Exchange 2013 it will delete the related AD User Account as well.

In order to restore you could simply restore the AD user account which will restore the Mailbox.

Notes to be remembered

– This setting is irreversible

– A Deleted object stays their for 180 days by default(In case if this does not your business practice please refer

1 2 3 4 5 6

Once the above is done you could access the ADAC select  your domain name then  you will find the Deleted Object whereas you could select the user account and select the Restore Option on the Actions pane.


February 1, 2015 at 10:19 am Leave a comment

Time Sync Issue on Virtualized Domain Controllers VM on Hyper-V and VMware

Dear Folks

Recently we noticed that our Domain Controller(VM) was throwing the Wrong time and forcing all the other servers and the client pc’s the wrong time.

Hence we started digging the problem by initially finding the source for our Domain Controller Clock it was found out by using the below command

w32tm /query status

Source: VM IC Time Synchronization Provider

This means the source is the Hyper-V Guest Integration Time Service.and in turn our Hyper-V server was having the wrong time.

Therefore what we did  is we disabled the  “Hyper-V Time Synchronization Service” via services. thereafter we ran the command mentioned above  and the source became

Source: Local CMOS Clock

Then we set the local clock on DC to the correct time and  noticed that all our servers and client started taking the time from the Domain Controller correctly.

So as a practice I would advice to do the same when your  DC is sittings as a VM on any Hypervisor to avoid time sync issues.


As per the new recommendation Microsoft is saying to keep the Time Synchronization service enabled and make the below registry entry on the virtualized PDC emulator

reg add HKLM\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\VMICTimeProvider /v Enabled /t reg_dword /d 0

and add an external source.


On the PDC Emulator role  server type the below command to check the communication between the NTP server.

w32tm /stripchart /computer:<target> /samples:<n> /dataonly

Then if it is working fine change the NTP as below;

w32tm /config /manualpeerlist:<peers> /syncfromflags:manual /reliable:yes /update


As per the VMware recommendation

– Keep the VM Tools Time Synchronization Disabled (By Default)

– Configure the ESXi host to use an external time source(Router / Switch / Public Server)

– Configure the PDC emulator for the external time source same as ESXi Host.


I would like to mention the few commands below which will be useful when dealing NTP issues on Windows;

To Stop/Start NTP
net stop w32time
net start w32time

To Remove and Install the service
w32tm /unregister
w32tm /register

To Configure the PDC to use an external source:
w32tm /config /maunalpeerlist:”” /syncfromflags:manual /reliable:yes /update

To Query the status
w32tm /query /status
w32tm /query /configuration (The output must shows the Type as NTP instead of NTDS5)

To force the time
w32tm /resync /rediscover
w32tm /config /update

To find the configuration
w32tm /query /configuration

To check the locaol NTP source
w32tm /query /source

To manually check the time source
w32tm /stripchart / /samples:5 /dataonly


To force the member server to sync with the domain controllers available in the domain

w32tm /config /syncfromflags:domhier /update (If the NTP service is disabled make it to manual mode).

September 22, 2014 at 10:26 am 1 comment

Inaccessible boot device on Windows 2012 with EMC Networker


I would like to share my experience related to the above error.

Recently we received a call from our customer saying that 2 VM’s were not booting. We were in panic mode as these 2 servers are the domain controllers and the backup software which was supposed to do the BMR also failing.

Thereafter when we contacted Microsoft Support the team identified the error is due to the “nsrbbwi” key which being added on the Registry by our EMC Networker Backup Tool and once it was removed the servers booted normally.

Go to the below Registry via the Command Prompt from the System Recovery Options



Remove the Value for “Upperfilters” as it will be pointed to “nsrbbwi”

Reboot the server.

-Microsoft PSS
Best regards

March 6, 2014 at 9:23 am Leave a comment

How to migrate the Hyper-V CSV’s to a new Storage

Dear Folks

Recently we sold a VNX 5300 storage to our customer and his intention was to migrate the data from his old EMC AX4 5i Storage.

We proposed him the SAN based migration option but customer was resisting and we have to do it on the Windows level.

The Environment

2 Node Windows 2008 R2 Hyper-V Cluster CSV enabled.
Ax4 5i Storage
EMC Powerpath Free Edition installed on both hosts.

Steps Performed.

– Initialized the new storage
– Configured the new LUN’s
– Connected a new HBA’ (Because the server was having only single free PCIE slot)
– Assigned the LUN’s to both the server.
– Logged in to one of the server ( which was the current owner for the CSV)
– Added the LUN as disk via Storage from Failover Cluster Manager)
– Added as CSV (via Cluster Shared Volume from Failover Cluster Manager)
– Exported the Virtual Machine to the new location on the C:\ClusterVolume(Can be any name as per your environment)\NewFolder –>Which will point it to the new disk)
– Deleted the VM from the Hyper-V Manager
– Imported VM again from the new location via the Hyper-V Manager.(Do not change any options from the Import Wizard)
– Finally Changed the Quorrum drive to the new LUN on the Storage via Change Cluster Quorrum Settings from the Failover Cluster Manager)
– Removed the Old Storage
– Fixed the Additional HBA
– Removed EMC Powerpath
– Enabled MPIO

Voila everything went smooth as ice.

Hope this article is useful and incase if you need any additional information please do not hesitate to contact me.

February 6, 2014 at 8:07 am Leave a comment

How to Disable IPV6 on Windows

Dear Folks

Some of us will encounter the below error message on a DNS server installed on Windows 2008 / 2012




But this is not a real problem ,and there will be no technical glitches based on this also Microsoft do not recommend disabling the IPV6 on Windows and Exchange servers.

Still if you want to hide this error you could do either of the below option

Option 1

1.identify the name of the LAN connection using ipconfig(in my LAB the name of the connection is “Local Area Connection”

2. netsh interface ipv6 delete dnsserver “Local Area Connection” ::1


1.netsh interface ipv6 show interfaces

2.netsh interface ipv6 delete dnsserver name=”IDX#” address=::1

NOTE:- Keep reading on IPV6 and Microsoft guidelines and discussion since these are getting updated frequently

Good Luck..

May 15, 2013 at 10:47 am Leave a comment

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