A domain controller is a server in a Microsoft Active Directory or NT4 domain that is responsible for central authentication.

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Scope reconfiguration - decreasing subnet mask and ip range

i've been asked to change my subnet mask on our network from a 255.255.0.0 to a 255.255.255.0 (we are using DHCP and are using windowsServer 2012). - this should not be an issue for the number of ...
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2answers
73 views

An active directory domain could not be contacted

I have this problem with joining client PCs to the domain. I think i did everything right, set up AD DS, DHCP, DNS on my server, turned off the DHCP server on my router. I ensured that the Preferred ...
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1answer
23 views

Windows Server 2008 R2 functional level - DSQUERY

After executing some queries (dsquery computer domainroot -stalepwd), using dsquery, I was told this command connects to the available DC and for this reason the results might be untruthful because ...
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37 views

AD Replication with 3 sites/locations

I have created new forest with domain.local. Domain have 3 locations - A, B, C. ( One dc per location ) First dc-A is owner all FSMO roles. After configure all 3 sites with subnets added 3 IP "Inter ...
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22 views

Show domain user on login screen

I've a domain used by both teachers and students. Right now teachers can able to input username and password easily but for the students its quite difficult for them to do the task. I've created two ...
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66 views

Cannot promote Windows Server 2012 R2 to Domain Controller at a new site. “The wizard cannot gain access to the list of domains in the forest.”

I'm opening a new site (physical and logical) in my international Windows domain. The site is connected to the main office by a VPN over a slow connection (I'm using pfsense as my main router and ...
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1answer
14 views

VM User Login data - How can I monitor user login data from DC?

I would like to generate report or send email when someone logs in to any of Virtual Machine's under the Domain Controller server. How can I do it? Some where I read that we should Use WMI/ADSI to ...
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52 views

Unable to change domain credentials on Windows client PCs

Any time a user's password expires, or they want to change the password before it does, they will see the following error message: configuration could not be read from the domain controller either ...
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100 views

Need to start over with a new Active Directory domain. How far do I tear down the DC?

I built a Windows Server 2012 R2 PDC for a new domain. It's still in its infancy with only one DC and one member computer. Now I need to remove all traces of that domain and start fresh because: It ...
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57 views

Can't open Active Directory Users and Computers, although AD is operational

This is the error I'm getting when trying to open Active Directory and Computers on the Domain Controller: Naming information cannot be located because: The network path was not found. The NETLOGON ...
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27 views

Migrating PKI and CA of a Domain Controller that needs to be demoted

I have a Domain Controller that for some reason beyond me has ADCS installed on it. The domain controller is a 2008 R2 server and needs to be demoted, but first I need to do one of two things. This ...
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49 views

Active directory user sessions are not appearing under the “Collections/Connections” in Remote Desktop Services

I am currently using Windows Server 2012 r2 and I am trying to setup RDP shadow services on my services to be able to remotely connect to current user sessions who are on the domain, I set up all the ...
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1answer
37 views

Domain for Multiple Companies

Hope all is well with everyone. We would like to inquire the best practice on creating domains for multiple companies under one Parent company as we are a group of companies. From our research we ...
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2answers
46 views

Keep the same IP and host name for new domain controller as crashed one

Because of some disaster I have lost my primary domain controller and thanks god that I had secondary domain controller so I could provide the service to the computer and save my data. After that I ...
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2answers
65 views

Which Ports need to be accessible on a Domain Controller for Clients to logon?

We are currently segmenting our network. We will move the servers in another subnet than the clients. Of course the clients still need access to the domain controller to authenticate against it. I ...
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14 views

Windows 10 Connect to Disconnected user session without password as Domain Admin

I have a Windows 10 PC (Virtual Machine) on a domain and a domain user logged in to it (albeit disconnected). This user has started some applications that have caused a massive consumption of network ...
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1answer
27 views

Connect Access Domain Controller Over VPN

We have a remote base which we would like to connect to our main office. We bought a VPN capable router thinking this would dial the vpn and our remote PC would connect seamlessly. Unfortunately ...
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1answer
26 views

Exchenge 2010 server is not finding GC server in the domain

Exchenge 2010 server is not finding GC server in the domain even the domain controler . All Domain controllers are Windows Server 2012 Std. In the atest.local forest I have 3 DC and all 3 are GC: PS ...
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49 views

DC3 doesn't replicate with newly added DC1

[DC 1 - LOTUS] [DC 2 - IRIS] [DC 3 - FLORA] The picture above shows my domain network connection. My original DC1 was PYRUS, due to some reasons, it is dead and be replaced by LOTUS. I Seize all ...
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1answer
107 views

WMI “Access Denied” to Read Only Domain Controller

From a management machine using wbemtest, we are able to successfully connect to a remote Read-Only Domain Controller that is running Windows Server 2012 R2 Datacenter with a user who is a member of ...
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1answer
94 views

Issues adding new DC to network after main DC broke down

What I try to do should be something simple but I made in ended up bad. We have a virtual network and virtual machine set up on Azure East Asia region datacenter originally. Then, we decided to move ...
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21 views

A domain controller in Azure ends up public on the Internet with no firewall - is it compromised? [duplicate]

I'm helping a customer stand up an Azure environment and they decided to stand up a server (DC) on their own without asking for help. The only access method is supposed to be IPsec, but they forgot ...
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3answers
36 views

Reconnect to Domain Controller after temporary disconnect in Server 2012

I have 5 RDP Servers running Windows Server 2012. Our Domain Controller was temporarily taken off of the network for 5 minutes due to a bad switch. Even after it has been brought back online, when ...
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59 views

Seizing a domain from dead primary domain controller

My old Primary Domain Controller died after a series of power problems. I tried to follow this set of instructions http://kpytko.pl/active-directory-domain-services/seizing-fsmo-roles/ to get another ...
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1answer
47 views

DC Replication over VPN Server 2012R2

I Have two sites right next to one another connected using Draytek routers an IPSEC secure vpn tunnel. One site had all the servers the other none. I installed a new DC on the main site them moved ...
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131 views

Inconsistent winbind info on Samba 4 AD domain controller

I've setup a Samba 4 AD domain controller on Debian Jessie (samba 4.2.10). Everything's working fine, except that winbind gives wrong user/group information. I have a sample user "testuser" and a ...
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39 views

Targeted GPO deployments from Samba (4) DC

I've seem to be stuck. I come from a mostly POSIX background, & thrown into the deep-end on this one, so learning as I go along - so not sure if there's no solution, or if it's my own Dunning-...
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1answer
23 views

Adding an IPv4-only Domain Controller to an existing pool of Domain Controllers with both IPv6 and IPv4

We have an existing pool of Windows 2008 R2 Domain Controllers on-premises. These Domain Controllers have IPv6 and IPv4 configured. Now we need to add another Domain Controller that will seat on an ...
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1answer
71 views

Guidelines and Best Practice: Prep to Temporarily Shutting Down an Active Directory Domain Controller

1 AD domain. 3 total Domain controllers, all on 2008 R2 The primary DC (with FSMO roles) is being moved to a new office and it will be offline for a maximum of 3 days. This DC also serves DNS but ...
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45 views

How should I manage my cloud-hosted virtual networks/machines?

I am currently hosting multiple production projects in Microsoft Azure. Each project is configured with a separate virtual network with two Windows VMs to act as web servers, and one server to act as ...
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100 views

The schema master did not complete a replication cycle after the last reboot

I'm attempting to add a Windows Server 2012 Domain Controller to an Existing Windows Server 2003 network, and then following that, will migrate it to be the domain master. I'm following this tutorial ...
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89 views

Suddenly i can not join Windows clients to Samba PDC anymore

Some years ago i configured a Primary Domain Controller through Samba and LDAP (slapd) on an Ubuntu machine (13.10) at 192.168.69.203 which should be accessible by the NetBIOS name SRV1. I must note i ...
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252 views

smbclient: Connection to localhost failed (Error NT_STATUS_CONNECTION_REFUSED)

until yesterday I had a functioning Active Directory Primary Domain Controller running on a raspberry pi. Now it seems I cannot get the 'samba' service to listen at all. This is since performing an ...
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1answer
199 views

Secondary domain controller not functioning when primary domain controller is not reachable

We are small business intelligence company and we have a head office and a branch office. I have active directory running on windows 2012 R2 in the head office and another active directory running on ...
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34 views

How to get remote users to authenticate?

We have some remote users who are rarely on the company LAN. They may be remote for six months or more during a year. Every so often we encounter the problem of errors like: "There are currently no ...
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1answer
95 views

Active directory 2012 password policy

I have a windows server 2012 R2 active directory environment running in my office. I have a primary domain and a child domain. Both the domains have password complexity enabled. Active directory ...
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38 views

Design Recommendation to Future Proof Active Directory

We are currently setting up the first Active Directory for a business within a brand new private equity group. This private equity group owns 4 businesses and will be acquiring many more. I ...
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29 views

What could be the reasons to configure LAN clients to use the server IP as DNS server in a domain controller Windows network?

This is rather a basic networking question, but I have found this configuration on several domain controllers with Windows Server, and I think ServerFault should be the proper site to ask. What are ...
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1answer
80 views

Can I use ansible to startup jboss service in domain mode?

I used sh /usr/local/jboss/bin/domain.sh manually, and jboss works fine. When I use ansible to start jboss automatically, jboss log always shows "Container is down". File /root/startup_jboss.sh : #!...
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What causes a workstation to lose trust with the domain controller?

I've received the error several times on Windows 7 Workstations and Laptops where it loses trust with the domain controller, and I know how to fix it, but why does it do that?
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163 views

All options greyed out when trying to configure Active Directory Domain Services Windows Server 2012 R2

I am configuring the first domain controller for a new domain. The install of Active Directory Domain Services seemed to go ok, but when I attempt to configure the domain controller it gets stuck on ...
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138 views

Server 2012 stopped accepting computers joining to our domain with error 53: the network path was not found

We have Windows Server 2012 R2 Standard as our DC. Several workstations were added to our domain successfully. But then (I cannot determine what exactly could be a show-stopper) it stopped accepting ...
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2answers
44 views

Remote Desktop Services role - Do I need it in order to use MSTSC (RDP/RDC) in my domain?

Greetings and thanks for reading (apologies for the length). I'm a new Sys Admin and I have a (potentially silly) question for the more seasoned veterans. I'm migrating our primary Domain Controller ...
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19 views

Issue with creating a new forest and promoting a domain controller

I am creating a forest and domain controller for the first time. The error I get is: Error determining whether the target server is already a domain controller: Starting a command on the remote ...
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439 views

How to disable Null Session Enumeration of the DC?

I am a sysadmin for a company, and we just had a Penetration Test done on our internal network, the team discovered that it is possible to perform query\enumerate our DC (Server 2012) for information ...
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2answers
59 views

Hyper-V standards, replication before or after exchange

I'm currently building my own lab to improve, however I have a couple of general questions. I have 2 dell R710 servers, with 2012r2 and the hyper-v role installed. What I want to do is build up 4 ...
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26 views

New site is not listed when adding new domain controller

I inherited this network and I'm trying to figure out what I am missing. I created a new site in Chicago and I want to add a domain controller to it but the new site is not listed when I go to ...
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16 views

Running Session Virtualization in Server 2012 off a single server box

My technical level is below average here. I have an HP (Proliant DL380 Gen9 Xeon e5-2620) machine running Server 2012 and Wyze thin clients off which I want to run 10 full Windows 8 Remote Desktop ...
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1answer
111 views

Can't log in to the DC remotely as Admin

I need some assistance ASAP my old IT Manager who got fire mess up our DC. Now I can' login to DC remotely as Administrator. Non of the 5 Windows servers that I have. This is the error message " To ...
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67 views

Explain how FRS replication backup works

Please explain me why I have to add just some registry keys to repair sysvol-replication. I mean, it is like file-based and I want to backup it before I change anything. There are some NtFrs 13568. 2 ...