The Windows Connector script normally sets the required permissions for the OpenDNS_Connector user. However, in strict AD environments, some administrators may not be permitted to run VB scripts on their Domain Controllers, and thus will need to manually replicate the actions of the Windows Configuration script. This article details what permissions are required to be set on the DC.
Note: For the purpose of this article, OpenDNS_Connector is assumed to be the sAMAccountName of your Connector account in AD. If you are using a custom name instead, follow the same instructions with the sAMAccountName of your connector account instead of OpenDNS_Connector.
If the OpenDNS_Connector user has insufficient permissions to operate, you will notice that an AD Connector is showing an alert or error state in the dashboard, and the message listed when you hover over the alert is Access Denied to one of the registered domain controllers.
Ensure that the OpenDNS_Connector user is a member of the following AD Groups:
- Enterprise Read-only Domain Controllers
- Event Log Readers (only if the deployment includes Virtual Appliances)
In addition, the OpenDNS_Connector user should belong to the "Domain Users" and "Users" groups. You can verify the group membership of the OpenDNS_Connector user with the following command:
dsquery user -samid OpenDNS_Connector | dsget user -memberof -expand
The Umbrella AD Connector performs two primary tasks for which these permissions are needed. First, it pulls LDAP information from Active Directory in order to allow you to create policies based on AD group, and to be able to display AD usernames and group names in the Umbrella Dashboard. The
Replicate Directory Changes permission allows this.
Second, it collects login events from Domain Controllers, passing them to the Virtual Appliances. This allows the Virtual Appliances to create their IP-to-user mappings and thus identify users. All of the permissions below apply to this with the exception of the
Replicate Directory Changes permission. These permissions are required only if the deployment includes Virtual Appliances in the same Umbrella site as the Domain Controllers.
Replicate Directory Changes
This permission allows the OpenDNS_Connector user to query LDAP. This is the required permission typically given with the "Enterprise Read-Only Domain Controllers" group. This provides the Umbrella Dashboard with the information needed to display the names of AD objects, and to determine group memberships. The connector requests the following attributes:
dn (Distinguished Name)
from the following objectClasses:
The built-in "Enterprise Read-only Domain Controllers" group should provide this permission, and thus the OpenDNS_Connector user should be a member of this group. You can verify the group's permissions or specify the permissions specifically for the OpenDNS_Connector user (if the group above does not supply these permissions) as follows:
- Open the Active Directory Users and Computers snap-in
- On the View menu, click Advanced Features.
- Right-click the domain object, such as "company.com", and then click Properties.
- On the Security tab, select either "Enterprise Read-only Domain Controllers" or the "OpenDNS_Connector" user.
- If necessary, you can add the "OpenDNS_Connector" user by clicking "Add".
- In the Select Users, Computers, or Groups dialog box, select the desired user account, and then click Add.
- Click OK to return to the Properties dialog box.
- Click to select the Replicating Directory Changes and Read check boxes from the list.
- Click Apply, and then click OK.
- Close the snap-in.
Event Log Readers
This change is required only if the deployment includes Virtual Appliances in the same Umbrella site as the Domain Controller. Membership in this group allows the OpenDNS_Connector user to read the logon events from the Event Logs.
On the Domain Controller machine, in the Windows Advanced Firewall settings ensure that the Inbound rules for Remote Event Log Management (NP-In, RPC and RPC-EPMAP) are allowed. The Umbrella AD Connector may log an error saying "The RPC Server is unavailable" and may not be able to read login events if these rules are not allowed.
Remote Administration is needed to allow the connector to read login events on the domain controller. This permission is required only if the deployment includes Virtual Appliances in the same Umbrella site as the Domain Controller.
From a Command prompt, please run the following commands:
netsh advfirewall firewall set rule group="remote administration" new enable=yes
netsh advfirewall set currentprofile settings remotemanagement enable
This change is required only if the deployment includes Virtual Appliances in the same Umbrella site as the Domain Controller. The Audit policy defines what events get logged in the Event Log of the Domain Controller. The Connector requires that successful logon events are recorded so that users can be mapped to their IP addresses.
In normal Windows Server 2008+ environments, the legacy "Audit logon events" setting must be configured. Specifically, the "Audit logon events" policy must be set to "Success". This can be verified by running the following command at a Command Prompt:
This policy is defined as a Group Policy Object. To modify it, edit the appropriate Group Policy for your DC (typically the "Default Domain Controller Policy"), and set the following policy to include "Success" events:
Computer Configuration\Policies\Windows Settings\Security Settings\Local Policies\Audit Policy\Audit logon events
Please ensure that you update the Group Policy on the DC after making this change.
However, Windows Server 2008 also introduced the Advanced Audit Policy Configuration. While the legacy Windows Audit Policies can still be used, they will be ignored if any of the Advanced Audit Policies are defined. Refer to Microsoft documentation to understand how the two Audit Policies interact.
For the purposes of the Connector, if any Advanced Audit Policies are defined (including ones not related specifically to logon), then the Advanced Audit Policies MUST be used.
The Advanced Audit Policy should be set for all DCs using Group Policy. Edit the appropriate Group Policy for your DC (typically the "Default Domain Controller Policy"), and go to the following section:
Computer Configuration\Policies\Windows Settings\Security Settings\Advanced Audit Policy Configuration\Audit Policies\Logon/Logoff
In that section, set the following policies to include both "Success" and "Failure" events:
Audit Other Logon/Logoff Events
Ensure that you update the Group Policy on the DC after making this change.
If after confirming/changing the aforementioned settings, you are still seeing "Access Denied" messages in the Dashboard, please send Umbrella Support the Connector logs as outlined in this article: Provide Support with AD Connector Logs
When providing this information to Support, include the output of the following two commands:
auditpol.exe /get /category:* > DCNAME_auditpol.txt
GPRESULT /H DC_NAME.htm