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• Group policy applied to AD OU attributes

  - by Eric Smith

  I'm not well-versed in AD, so would like to resolve a question I have with regards to AD information. I understand that it is possible to apply group policy to OU's, thereby restricting access. What I'd like to know is, is it possible to do the same with OU attributes. Some context would help. There's a requirement to store address information in AD (IMO, a natural fit), but for various reasons, although obviously things like name should be globally accessible, access restrictions are desired on the address. In this case, is it possible to apply security to the address portion of the OU attributes, or does each address have to be broken into a separate OU (a solution that feels smelly given that address doesn't have identity)?

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• How do I integrate a OpenSolaris NAS with AD?

  - by Neo

  I basically want a OpenSolaris NAS (ZFS goodies) but I'd like to integrate it with AD, so that when I create a new user in AD, his roaming profile is created in the NAS. That means all his ACLs have to work (I know they're compatible), etc. The tutorials I found don't actually work, so any help would be much appreciated.

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• How to determine the Kerberos realm from an LDAP directory?

  - by tstm

  I have two Kerberos realms I can authenticate against. One of them I can control, and the other one is external from my point of view. I also have an internal user database in LDAP. Let's say the realms are INTERNAL.COM and EXTERNAL.COM. In ldap I have user entries like this: 1054 uid=testuser,ou=People,dc=tml,dc=hut,dc=fi shadowFlag: 0 shadowMin: -1 loginShell: /bin/bash shadowInactive: -1 displayName: User Test objectClass: top objectClass: account objectClass: posixAccount objectClass: shadowAccount objectClass: person objectClass: organizationalPerson objectClass: inetOrgPerson uidNumber: 1059 shadowWarning: 14 uid: testuser shadowMax: 99999 gidNumber: 1024 gecos: User Test sn: Test homeDirectory: /home/testuser mail: [email protected] givenName: User shadowLastChange: 15504 shadowExpire: 15522 cn: User.Test userPassword: {SASL}[email protected] What I would like to do, somehow, is to specify per-user basis to which authentication server / realm the user is authenticated against. Configuring kerberos to handle multiple realms is easy. But how to I configure other instances, like PAM, to handle the fact that some users are from INTERNAL.COM and some from EXTERNAL.COM? There needs to be an LDAP lookup of some kind where the realm and the authentication name is fetched from, and then the actual authentication itself. Is there a standardized way to add this information to LDAP, or look it up? Are there some other workarounds for a multi-realm user base? I might be ok with a single realm solution, too, as long as I can specify the user name - realm -combination for the user separately.

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• EFS Remote Encryption

  - by Apoulet

  We have been trying to setup EFS across our domain. Unfortunately Reading/Writing file over network share does not work, we get an "Access Denied" error. Another worrying fact is that I managed to get it working for 1 machine but no other would work. The machines are all Windows 2008R2, running as VM under ESXi host. According to: http://technet.microsoft.com/en-us/library/bb457116.aspx#EHAA We setup the involved machine to be trusted for delegation The user are not restricted and can be trusted for delegation. The users have logged-in on both side and can read/write encrypted files without issues locally. I enabled Kerberos logging in the registry and this is the relevant logs that I get on the machine that has the encrypted files. In order for all certificate that the user possess (Only Key Name changes): Event ID 5058: Audit Success, "Other System Events" Key file operation. Subject: Security ID: {MyDOMAIN}\{MyID} Account Name: {MyID} Account Domain: {MyDOMAIN} Logon ID: 0xbXXXXXXX Cryptographic Parameters: Provider Name: Microsoft Software Key Storage Provider Algorithm Name: Not Available. Key Name: {CE885431-9B4F-47C2-8415-2D766B999999} Key Type: User key. Key File Operation Information: File Path: C:\Users\{MyID}\AppData\Roaming\Microsoft\Crypto\RSA\S-1-5-21-4585646465656-260371901-2912106767-1207\66099999999991e891f187e791277da03d_dfe9ecd8-31c4-4b0f-9b57-6fd3cab90760 Operation: Read persisted key from file. Return Code: 0x0[/code] Event ID 5061: Audit Faillure, "System Intergrity" [code]Cryptographic operation. Subject: Security ID: {MyDOMAIN}\{MyID} Account Name: {MyID} Account Domain: {MyDOMAIN} Logon ID: 0xbXXXXXXX Cryptographic Parameters: Provider Name: Microsoft Software Key Storage Provider Algorithm Name: RSA Key Name: {CE885431-9B4F-47C2-8415-2D766B999999} Key Type: User key. Cryptographic Operation: Operation: Open Key. Return Code: 0x8009000b Could this be related to this error from the CryptAcquireContext function NTE_BAD_KEY_STATE 0x8009000BL The user password has changed since the private keys were encrypted. The problem is that the users I using at the moment can not change their password.

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• Migrating SBS 2003 to 2012 standard

  - by AryaW

  My company is currently trying to migrate a Windows Small Business Server 2003 to Windows Server 2012. We know the general procedure, but we want to make sure we aren't going to mess anything up tremendously. Here's the steps we were planning on taking: 1. Uninstall exchange 2. Remove legacy GPO's 3. Demote the domain controller 4. Promote the new server to the primary domain controller. We have no mail servers to worry about. My question is, will the above method work or will we need to make a complete new domain? Thanks!

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• Windows 7 cannot join samba domain

  - by Antonis Christofides

  I have a 3.5.6 samba server with a LDAP backend (both on Debian 6.0). I've been successfully adding Windows XP machines to the domain for years. I now try to add Windows 7. I have made the recommended registry changes, but I don't have any success so far. Here is what happens: 1. I go to computer name, select "Domain" instead of "Workgroup", type in the domain name, click OK. It asks me for the username and password of an account that can add computers to the domain; I enter them. After about 40 seconds, I get the following message: The following error occurred attempting to join the domain "ITIA": The specified computer account could not be found. Contact an administrator to verify the account is in the domain. If the account has been deleted unjoin, reboot, and rejoin the domain. Despite this, the samba server successfully creates the computer account. 2. Therefore, if I try again a second time, without deleting the already created computer account, I get a different error: The following error occurred attempting to join the domain "ITIA": The specified account already exists. (Note that until a while ago samba wasn't configured to automatically create computer accounts. What I did whenever I wanted an XP to join was to manually create it. When I first attempted to solve the Windows 7 join problem, I setup samba to do this automatically, as this is what most people do, as I understand, and I thought that it might be related. I haven't attempted to add an XP since I made this change, so I don't know if it works, but whether it works or not, the problem remains.) Update 1: Here are the relevant parts of smb.conf: [global] panic action = /usr/share/samba/panic-action %d workgroup = ITIA server string = Itia file server announce as = NT interfaces = 147.102.160.1 volume = %h passdb backend = ldapsam:ldap://ldap.itia.ntua.gr:389 ldap admin dn = uid=samba,ou=daemons,dc=itia,dc=ntua,dc=gr ldap ssl = off ldap suffix = dc=itia,dc=ntua,dc=gr ldap user suffix = ou=people ldap group suffix = ou=groups ldap machine suffix = ou=computers unix password sync = no add machine script = smbldap-useradd -w -i %u log file = /var/log/samba/samba-log.all log level = 3 max log size = 5000 syslog = 2 socket options = SO_KEEPALIVE TCP_NODELAY encrypt passwords = true password level = 1 security = user domain master = yes local master = no wins support = yes domain logons = yes idmap gid = 1000-2000 Update 2: The server has a single network interface eth1 (also an unused eth0 that shows up only in the kernel boot messages) and two ip addresses; the main, 147.102.160.1, and an additional one, 147.102.160.37, that comes up with "ip addr add 147.102.160.37/32 dev eth1" (used only for a web site that has a different certificate than other web sites served from the same machine). One of the problems I recently faced was that samba was using the latter IP address. I fixed that by adding the "interfaces = 147.102.160.1" statement in smb.conf. Now: acheloos:/etc/apache2# tcpdump host 147.102.160.40 and not port 5900 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes 13:13:56.549048 IP lithaios.itia.civil.ntua.gr.netbios-dgm > 147.102.160.255.netbios-dgm: NBT UDP PACKET(138) 13:13:56.549056 ARP, Request who-has acheloos2.itia.civil.ntua.gr tell lithaios.itia.civil.ntua.gr, length 46 13:13:56.549091 ARP, Reply acheloos2.itia.civil.ntua.gr is-at 00:10:4b:b4:9e:59 (oui Unknown), length 28 13:13:56.549324 IP acheloos.itia.civil.ntua.gr.netbios-dgm > lithaios.itia.civil.ntua.gr.netbios-dgm: NBT UDP PACKET(138) 13:13:56.549608 IP lithaios.itia.civil.ntua.gr.netbios-dgm > acheloos2.itia.civil.ntua.gr.netbios-dgm: NBT UDP PACKET(138) 13:13:56.549741 IP acheloos.itia.civil.ntua.gr.netbios-dgm > lithaios.itia.civil.ntua.gr.netbios-dgm: NBT UDP PACKET(138) 13:13:56.550364 IP lithaios.itia.civil.ntua.gr.netbios-dgm > acheloos.itia.civil.ntua.gr.netbios-dgm: NBT UDP PACKET(138) 13:13:56.550468 IP acheloos.itia.civil.ntua.gr.netbios-dgm > lithaios.itia.civil.ntua.gr.netbios-dgm: NBT UDP PACKET(138) (acheloos2 is the second IP address, 147.102.160.37). The above dump occurs when I click "OK" (to join the domain), until it asks me for the username and password of a user that can join the domain. I don't know why the client is contacting the second IP address. I tried temporarily deactivating it, but I still had some related ARP traffic (though I think not IP traffic).

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• How to make AD highly available for applications that use it as an LDAP service

  - by Beaming Mel-Bin

  Our situation We currently have many web applications that use LDAP for authentication. For this, we point the web application to one of our AD domain controllers using the LDAPS port (636). When we have to update the Domain Controller, this has caused us issues because one more web application could depend on any DC. What we want We would like to point our web applications to a cluster "virtual" IP. This cluster will consist of at least two servers (so that each cluster server could be rotated out and updated). The cluster servers would then proxy LDAPS connections to the DCs and be able to figure out which one is available. Questions For anyone that has had experience with this: What software did you use for the cluster? Any caveats? Or perhaps a completely different architecture to accomplish something similar?

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• Cannot resolve Hostname to IP, but IP to hostname works

  - by blade

  Hi, I have deployed a bunch of windows server VMs on a cloud hosting service. These machines are all joined to a domain controller on the same service, which also hosts DNS. All of the domain-joined machines have dynamic IP (along with the DC). If I try to resolve any of the hostnames remotely, it fails. For example, I am in SQL Server Reporting Services and I need to connect to a remote server. I provide the hostname of the desired target server and this fails, but then if I provide the IP, this works. How can I pass the hostname and have this resolve to IP? Is there anything I need to look for in the DNS server? It has records of the hostnames (in forward lookup I think), but reverse is empty. Isn't it the case that forward lookup resolves ip to hostname and reverse resolves hostname to ip? Also, I don't know what he subnet mask because this is not in my control, so the machines may not be in the same subnet - can this be a cause of the problem? Where is the problem? Thanks

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• RODC password replication and A/D sites and subnets

  - by Gregory Thomson

  I work at a school district with about 30 school sites. Windows 2008 A/D setup - all central at the district office. In A/D, all is under one site, and no subnets defined. One A/D forest and only one domain under that. We're now looking to start putting RODCs at the schools to put the authentication and DNS out there closer to them. I haven't worked with A/D sites and subnets, and only a little with RODC password replication. But just got an invite to a meeting to talk about this tomorrow... If we start breaking down the A/D pieces into sites/subnets, can we also use that as a way to help apply an RODC password replication policy in a way that matches so that only each school sites' users passwords are replicated/cached on their RODC?

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• Can I run AD commands from a standard PowerShell script?

  - by Ben

  I am putting together a script to run post-sysprep. It should check if the machine is on the network, and if it is then it should query AD to see if a computer account exists with it's service tag (we're using these as the hostnames of the machines.) If it does exist, it should delete the account and rejoin the machine to the domain. I have got the majority of the script running, but need to run the following: Remove-ADComputer -Identity $distinguishedName How can I run this from the "standard" powershell environment? I don't want to use the AD module. (By the way - I'm on a mixed mode 2000/03 domain as we are in the process of upgrading to 2008) I'm new to PowerShell so be gentle if I'm completely missing the point! Thanks, Ben

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• can't add sharepoint users from trusted domain

  - by user22215

  I have a very strange problem with our Sharepoint 2007 implementation. I went in today to grant access to a user and was greeted with "The user does not exist or is not unique." Let me start off by saying that this user is not on our domain we have a 2 way trust connecting to one of our subsidiaries. I can see the users in the people pick but can't add them into Sharepoint. This problem flared up after we had some trust issues last two days ago. So I must ask has anyone came across this error and if so what steps did you take to resolve it? This link further highlights my problem: http://social.technet.microsoft.com/forums/en-US/sharepointgeneral/thread/41265a91-191c-4952-9c8c-1e0129b9fd3a

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• Seizing naming master from child domain server

  - by meera

  when I am trying to seize the role from my child domain server the naming master I get the following error fsmo maintenance: seize naming master Attempting safe transfer of domain naming FSMO before seizure. ldap_modify_sW error 0x34(52 (Unavailable). Ldap extended error message is 000020AF: SvcErr: DSID-03210380, problem 5002 (UN AVAILABLE), data 8438 Win32 error returned is 0x20af(The requested FSMO operation failed. The current FSMO holder could not be contacted.) ) Depending on the error code this may indicate a connection, ldap, or role transfer error. Transfer of domain naming FSMO failed, proceeding with seizure ... Server "win-fb20ixk90mu" knows about 5 roles Schema - CN=NTDS Settings,CN=WIN-3918XHC5STU,CN=Servers,CN=Default-First-Site-Na me,CN=Sites,CN=Configuration,DC=HCL,DC=com Naming Master - CN=NTDS Settings,CN=WIN-FB20IXK90MU,CN=Servers,CN=Default-First- Site-Name,CN=Sites,CN=Configuration,DC=HCL,DC=com PDC - CN=NTDS Settings,CN=WIN-FB20IXK90MU,CN=Servers,CN=Default-First-Site-Name, CN=Sites,CN=Configuration,DC=HCL,DC=com RID - CN=NTDS Settings,CN=WIN-FB20IXK90MU,CN=Servers,CN=Default-First-Site-Name, CN=Sites,CN=Configuration,DC=HCL,DC=com Infrastructure - CN=NTDS Settings,CN=WIN-FB20IXK90MU,CN=Servers,CN=Default-First -Site-Name,CN=Sites,CN=Configuration,DC=HCL,DC=com

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• Running a service with a user from a different domain not working

  - by EWood

  I've been stuck on this for a while, not sure what permission I'm missing. I've got domain A and domain B, A trusts B, but B does not trust A. I'm trying to run a service in domain A with a user account from domain B and I keep getting Access is Denied. I'm using the FQDN after the username and the password is correct. The user account from domain B is a local administrator on the domain A server, the user account has the logon locally, and as a service permissions. Must. Get. This. Working. Update: I found something interesting in the logs I must have missed. This ought to get me pointed in the right direction. Event ID: 40961 - LsaSrv : The Security System could not establish a secured connection with the server ldap/{server fqdn/fqdn@fqdn} No authentication protocol was available. I've found a few fixes for 40961 but nothing has worked so far. I've verified reverse lookup zones. nslookup resolves the correct dc properly. still workin' at it. Upadte: In response to Evan; I ran " runas /env /user:ftp_user@fqdn "notepad" " then entered the users password and notepad came up. It seems to work successfully. This issue is now resolved. The problem is visible in the screenshot. Windows tries to use the UPN for the user account if you dig your user out of AD with the Browse button. This fails every time even with the right user and password. Simply using the SAM format (Domain\User) works. So simple, yet so annoying. Can't believe I missed this. Thanks to everyone who helped.

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• Copy files between two windows machines on seperate domains

  - by Simon

  I need to copy several database backups between two computers. The source computer initiates the copy and is a Windows 2000 pc and is a member of domain1. The destination machine is running Windows Server 2000 and is a member of domain2. The machines are on separate networks physically connected via a firewall. The files are currently copied via ssh with http://sshwindows.sourceforge.net/ installed on the destination machine. There is no need to encrypt the contents during the copy, however the passwords should not be sent in the clear. I am looking for a way to copy the files without having to install a server on the destination. I specifically need help with how to set up the permissions and what ports would need to be opened on the firewall.

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• Migrating LDAP user and password to SAMBA4 AD

  - by Rudy Dajoh

  As title suggests. We are migrating from OpenLDAP as user authentication to Samba 4 AD Domain. But I can't find any information on how to transfer passwords and users to Samba 4 AD. How to migrate all LDAP user base at ou=People,dc=company,dc=com to samba 4 AD domain? I don't need to assistance transferring everything, I only need to transfer user accounts. I've finished migrating them all but user/passwords. Can it be done? If so, how?

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• How to create a password-less service account in AD?

  - by Andrew White

  Is it possible to create domain accounts that can only be accessed via a domain administrator or similar access? The goal is to create domain users that have certain network access based on their task but these users are only meant for automated jobs. As such, they don't need passwords and a domain admin can always do a run-as to drop down to the correct user to run the job. No password means no chance of someone guessing it or it being written down or lost. This may belong on SuperUser ServerFault but I am going to try here first since it's on the fuzzy border to me. I am also open to constructive alternatives.

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• Restricting Access to Application(s) on Point of Sale system

  - by BSchlinker

  I have a customer with two point of sale systems, a few workstations and a Windows 2003 SBS Server. The point of sale systems are typically running QuickBooks Point of Sale and are logged in with a user who has restricted permissions / access (via Group Policy). Occasionally, one of the managers needs to be able to run a few additional applications -- including some accounting software. I have created an additional user for this manager, allowing them to login and access the accounting software. The problem is, it can be problematic to switch users on the system, as QuickBooks takes a few minutes to close (on POSUser) and then reopen (on ManagerUser). If customers are waiting, this slows things down drastically. Since the accounting software is stored on a network drive, it would be easiest if the manager could simply double click something, authenticate against the network drive / domain controller and then the program would launch. When they close the program, the session to the network drive would be lost and the program would no longer be accessible. Is there any easy way to do this? Both users are on a domain and the system is Windows 7. I just don't want to require the user to switch back and forth. In a worst case scenario, they forget to switch back and leave the accounting software wide open.

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• AD, Windows-NT Authentication queries

  - by rockbala

  Need Help on the following questions. When a users login (on a computer in the network) is validated against AD what is/are the authentication method used? When a users login is validated in Windows NT environment (not AD) what is/are the authentication method used? If all user's account is on AD, is it possible to change the authentication mechanism only (or protocols) from AD to NT and vice versa (if possible)? If part/whole of question 3 is valid, where should one look to change these authentication methods ? What is the difference between AD and Windows-NT authentication ? Windows server 2008 Domain controller used. Regards, Balaji

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• Best Timing for Windows AD Domain Name Change

  - by Cliff Racer

  A while back when I first started with my company, the domain had already been set up using a "xxx.net" DNS name for the internal AD namespace. The shortname is just fine and I feel no need to change it but I have always hated how we used an internet DNS name for our internal AD. We are planning an AD upgrade from 2003 to 2008R2 and I would like to work this DNS name change if possible. I know there are procedures for doing a full domain name change but my question is: Is a FULL domain name change neccessary if all I want to change is the internal DNS name of the domain? Would it be better to do this change after the 2008R2 domain upgrade?

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• getent passwd fails, getent group works?

  - by slugman

  I've almost got my AD integration working completely on my OpenSUSE 12.1 server. I have a OpenSUSE 11.4 system successfully integrated into our AD environment. (Meaning, we use ldap to authenticate to AD directory via kerberos, so we can login to our *nix systems via AD users, using name service caching daemon to cache our passwords and groups). Also, important to note these systems are in our lan, ssl authentication is disabled. I am almost all the way there. Nss_ldap is finally authenticating with ldap server (as /var/log/messages shows), but right now, I have another problem: getent passwd & getent shadow fails (shows local accounts only), but getent group works! Getent group shows all my ad groups! I copied over the relavent configuration files from my working OpenSUSE 11.4 box: /etc/krb5.conf /etc/nsswitch.conf /etc/nscd.conf /etc/samba/smb.conf /etc/sssd/sssd.conf /etc/pam.d/common-session-pc /etc/pam.d/common-account-pc /etc/pam.d/common-auth-pc /etc/pam.d/common-password-pc I didn't modify anything between the two. I really don't think I need to modify anything, because getent passwd, getent shadow, and getent group all works fine on the OpenSUSE11.4 box. Attempting to restart nscd service unfortunately didn't do much, and niether did running /usr/sbin/nscd -i passwd. Do any of you admin-gurus have any suggestions? Honestly, I'm happy I made it this far. I'm almost there guys!

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• Is it safe to delete "Account Unknown" entries from Windows ACLs in a domain environment?

  - by Graeme Donaldson

  It's not uncommon to see entries in Windows ACLs (NTFS files/folders, registry, AD objects, etc.) with the name "Account Unknown (SID)". Obviously these are because of old AD users or groups which at some point had permissions manually configured on the relevant object and have since been deleted. Does anyone know if it is safe to remove these "Account Unknown" ACEs? My gut feeling is that it should be just fine, but I'm wondering if anyone has any past experiences where doing this has caused trouble? Normally I just ignore these, but the company I'm working at now seems to have an abnormal number of these, most likely due to past admins' inexperience with AD/Windows and assigning permissions to user accounts rather than groups in all sorts of weird places. FWIW, our environment is not complex, a single domain forest, 4 DCs in 3 sites, with all network connectivity and replication healthy, so I'm certain that these "Account Unknown" entries are really old accounts, and not just because of some failure to resolve the SID to a human-readable name.

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• Powershell - how to set multiple action on get-aduser "dataset"

  - by Patrick Pellegrino

  I'm trying to run a script that modify password for multiple AD user accounts, enable the accounts and force a password change at next logon. I use this code but that's not work : Get-ADUSER -Filter * -SearchScope Subtree -SearchBase "OU=myou,OU=otherou,DC=mydc,DC=local" | Set-ADAccountPassword -Reset -NewPassword (ConvertTo-SecureString -AsPlainText "NewPassord" -Force) | Enable-ADAccount | Set-ADUSER -ChangePasswordAtLogon $true If I run the Get-ADuser line with ONLY one of the other line that's run fine ex : Get-ADUSER -Filter * -SearchScope Subtree -SearchBase "OU=myou,OU=otherou,DC=mydc,DC=local" | Enable-ADAccount Where I'm wrong ? I'm new to PowerShell probably I'm misunderstanding something.

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• dns in a small network with router and AD domain

  - by Felix

  I have a small office network with router (running OpenWRT), Windows Domain Controller (used to be 2008R2; I just backed it up and upgraded to 2012), about a dozen AD clients (3 server and windows workstation) and several non-AD clients (network printer, PBX). The problem is that the clients can't access servers by name (only by IP). I tried all kind of permutations. Right now domain controller runs DNS server for all desktops; but unless I put an entry in hosts file - I can only get by IP. I have router as DHCP server (since not all devices are on AD); and except for Domain Controller all IP addresses, including "static", are assigned by the router. Most frustrating, some servers sometimes just work! for example, I can often get to the Linux box by name (it is part of Domain using Beyond Trust Integration Services); but I can never get to SQL Server box. Seems like non-domain devices see more names than domain members... This network should be fairly typical; but I couldn't get any guidance about how to set up DNS/DHCP service to make all nodes happy. The closest is this question, but still it's different! Thanks

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• Win2008 DC in a Windows 2000 domain: can I keep the old DC?

  - by gravyface

  Will be putting a new Windows 2008 SE Server into a single domain network with two domain controllers, both running Windows 2000 Server. The functional level of the domain is mixed mode/2000. Until a second 2008 DC can be purchased, I'd like to leave the current Win2k operational master DC as a backup DC as the other member servers running 2003 have either accounting/SQL or Exchange on them. Eventually all the w2k servers will be decommissioned, but until then, I need another DC for redundancy. Following the standard process for adding a new DC, can I leave the old operational master DC (or the other backup DC) running after I transfer the FSMO roles to the new server? Will this cause any issues?

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• AD domain on web servers behind NAT - DNS issues?

  - by Ant

  I'm trying to setup an AD domain to manage the security between two Windows Server 2008 webservers that will sooner or later use NLB to balance website requests. I've hit a problem which I think is a simple solution and is down to DNS. My website domain is mydomain.com. The two servers are running behind a NAT firewall on the 10.0.0.0 IP range. I've setup the AD domain to be called ad.mydomain.com (as recommended by MS and a few other answers to questions on here). The second web server however doesn't want to join the domain, and gives an error pinning the problem on DNS - "ensure that the domain name is typed correctly" even though it queries the SRV record successfully and gets the correct DC back - dc.ad.mydomain.com. Doing a dcdiag /test:dns on the DC gives the Delegation error 'DNS Server dc.mydomain.com Missing glue A record'. I have a feeling I need to add something to the public DNS so that it in some way knows about ad.mydomain.com. Can anyone suggest whether I'm on the right track in adding something to the public DNS? Or whether it's something else? Many thanks

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