The following documentation provides guidance on how to use multiple top-level domains and subdomains when federating with Office or Azure AD domains. Federating multiple, top-level domains with Azure AD requires some additional configuration that is not required when federating with one top-level domain. When a domain is federated with Azure AD, several properties are set on the domain in Azure. One important one is IssuerUri. The federation service identifier is a URI that uniquely identifies a federation service.
The federation service is an instance of AD FS that functions as the security token service. A problem arises when you add more than one top-level domain. For example, let's say you have set up federation between Azure AD and your on-premises environment.
ADFS setup with multiple domains. Certificate and A records requirements for multiple domains.
For this document, the domain, bmcontoso. Now a second, top-level domain, bmfabrikam. When you attempt to convert the bmfabrikam. The reason is, Azure AD has a constraint that does not allow the IssuerUri property to have the same value for more than one domain. To work around this constraint, you need to add a different IssuerUri, which can be done by using the -SupportMultipleDomain parameter.
This parameter is used with the following cmdlets:. Using the parameter allows the PowerShell command to complete successfully.
This value is set by taking the domain portion of the users UPN and setting it as the domain in the IssuerUri, i. If, a match cannot be found, the authentication will fail. This element will match the Azure AD configuration, and authentication will succeed. In order to use the -SupportMultipleDomain switch when attempting to add new or convert already existing domains, your federated trust needs to have already been set up to support them.
The reason is, when it is originally set up without the -SupportMultipleDomain parameter, the IssuerUri is set with the default value.
If you try to add the -SupportMultipleDomain switch, you will receive the following error:. Use the steps below to add an additional top-level domain. If you have already added a domain, and did not use the -SupportMultipleDomain parameter, start with the steps for removing and updating your original domain.
If you have not added a top-level domain yet, you can start with the steps for adding a domain using PowerShell of Azure AD Connect. When you add a subdomain, because of the way Azure AD handled domains, it will inherit the settings of the parent. So, the IssuerUri, needs to match the parents.
So lets say, for example, that I have bmcontoso. The IssuerUri for a user from corp. NOTE] The last number in the regular expression set is how many parent domains there are in your root domain. Here bmcontoso.
If three parent domains were to be kept i. Eventually a range can be indicated, the match will always be made to match the maximum of domains. Select the third claim rule, and replace. Now that you have Azure AD Connect installed you can verify the installation and assign licenses. Learn more about these features, which were enabled with the installation: Automatic upgradePrevent accidental deletesand Azure AD Connect Health. Learn more about these common topics: scheduler and how to trigger sync.
Learn more about Integrating your on-premises identities with Azure Active Directory.So 8 servers would be required in order to support 2 UPNs! Important Once you delete this trust users using the existing UPN will not be able to access any Office services until we issue the next command.
When connected to the Office tenant run the following command to create the trust:. Now we need to convert the newly added domain to a federated domain. This is done using this command remember to include the —SupportMultipleDomain parameter :. Now open a browser on an external client and access portal. Your email address will not be published. Learn about the latest security threats, system optimization tricks, and the hottest new technologies in the industry. Over 1, fellow IT Pros are already on-board, don't be left out!
TechGenix reaches millions of IT Professionals every month, and has set the standard for providing free technical content through its growing family of websites, empowering them with the answers and tools that are needed to set up, configure, maintain and enhance their networks. Henrik Walther Posted On September 13, Post Views: 4, Featured Links. Featured Product. Join Our Newsletter Learn about the latest security threats, system optimization tricks, and the hottest new technologies in the industry.
Single Tenant, Multi domains, Multi Forest, Single ADFS
You can create a federation server farm or install additional federation servers to an existing farm by using the AD FS Federation Server Configuration Wizard. For more information, see When to Create a Federation Server. When you choose the option to create a New federation server farm using the AD FS Federation Server Configuration Wizard, the wizard will attempt to create a container object for sharing certificates in Active Directory.
Therefore, it is important that you first log on to the computer, where you are setting up the federation server role, with an account that has sufficient permissions in Active Directory to create this container object.
Before federation servers can be grouped as a farm, they must first be clustered so that requests that arrive at a single fully qualified domain name FQDN are routed to the various federation servers in the server farm. This guide assumes that NLB has been configured appropriately to cluster each of the federation servers in the farm.
We recommend the following best practices for deploying a federation server in a production environment:.
If you will be deploying multiple federation servers at the same time or you know that you will be adding more servers to the farm over time, consider creating a server image of an existing federation server in the farm and then installing from that image when you need to create additional federation servers quickly.
If you do decide to use the server image method for deploying additional federation servers, you do not have to complete the tasks in Checklist: Setting Up a Federation Server every time that you want to add a new server to the farm.
Use NLB or some other form of clustering to allocate a single IP address for many federation server computers. The following table describes the tasks that must be completed so that each federation server can participate in a farmed environment.
For more information, see Certificate Requirements for Federation Servers. You may also leave feedback directly on GitHub. Skip to main content. Exit focus mode. Note When you choose the option to create a New federation server farm using the AD FS Federation Server Configuration Wizard, the wizard will attempt to create a container object for sharing certificates in Active Directory. Note If you do decide to use the server image method for deploying additional federation servers, you do not have to complete the tasks in Checklist: Setting Up a Federation Server every time that you want to add a new server to the farm.
And that would go down to having two separate ADFS servers in the domain. Are there any negative affects to having two ADFS servers inside a domain? They would obviously live on different URLs but would rely on the same AD forest for their auth backing. I can't say for certain someone could certainly prove me wrongbut I think the only thing you'd be losing out on is the Single Sign On cookie. I imagine that's a per-farm type of thing. That cookie signals you've already been authenticated via an ADFS server and doesn't bother authenticating you again if the ADFS server is configured to do this.
So some efficiently lost - probably not a big deal unless you are in a massive environment. It will just run another authentication against AD. Other than that, they will work just fine and authenticate users all day long. We have SingleSignOn disabled or I might have a definitive answer for you.
Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Is there any downside to having two ADFS servers in a domain? Ask Question. Asked 8 years, 10 months ago. Active 8 years, 10 months ago. Viewed 3k times. Nixphoe 4, 7 7 gold badges 29 29 silver badges 48 48 bronze badges. Active Oldest Votes. It knows it's already recently authenticated you. Matt Matt 1, 13 13 silver badges 10 10 bronze badges.
Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
Post as a guest Name. Email Required, but never shown. The Overflow Blog.Hi, you can have multiple ADFS farms in single domain however it is recommended to have one. What is business justification for having two? While troubleshooting a certificate mismatch with officean engineer at my office updated the token-signing certificate to sha This is the exact quote from the vendor:. Yes, it creates self-signed certificate by default when you install ADFS and you can check if it is configured to renew automatically.
Office Office Exchange Server. Not an IT pro? Resources for IT Professionals. Sign in. United States English. Ask a question. Quick access. Search related threads. Remove From My Forums. Asked by:. Archived Forums.
Multiple Domain Support for Federating with Azure AD
Active Directory Federation Services. This includes ADFS 2. This includes the following categories of questions: installation, update, upgrade, configuration, troubleshooting of ADFS and the proxy component Web Application Proxy when it is used to provide ADFS pre-authentication.
Note that this is not a developer forum, therefore you might not ask questions related to coding or development. Sign in to vote. Saturday, July 29, AM. Certs have always been a weakness of mine so I appreciate the help! Edited by ntalbot. Saturday, July 29, PM. You can set up second ADFS farm in same domain, go through document in previous post. Sunday, July 30, AM. Monday, July 31, PM. Tuesday, August 1, AM. Did it work? Tuesday, August 8, PM.ADFS in multi forest environments is still a very hot topic based on my day to day experience.
To put this in a little bit more perspective, the questions are usually asked in the context of Azure Active Directory, so the already renowned federated identity scenario. Before we get started I would like to clarify one thing. In fact, last time I worked on such a scenario, the relying party was AWS.
The basic scenario is the following: a company has two or more Active Directory forest and one Azure AD. The question arises on the ADFS design. How many ADFS farms would we need? How would this work? Is this supported?
To start with the last question: yes, this is supported and you can use only one ADFS farm. However, in order for this to work, there are some conditions that need to be met. Yes, it is that simple. The authentication flow is also the usual one.
During the next step, ADFS will try to validate the user identity with a domain controller in the forest where it is installed. Also based on my experience, in most of the cases there is a networking issue if this flow breaks at a certain point. ADFS uses the LDAP protocol to communicate with domain controllers and certainly we have to make sure that this communication is not blocked by firewalls or other network devices. So if you encounter problems, first thing to do is to perform a test authentication and take Http and Network traces and to check exactly where the communication is blocked.
Most of the times, when the network problem is resolved, everything will work perfectly. I tried to keep it short and simple, since this is really not complicated at all, even if it looks frightening at first due to the several components of this specific architecture. When we speak about Azure AD we can complicate this scenario a bit, by having several forests and several Azure ADs at the same time, but in the end this is also possible with one ADFS deployment.
But I will dig into this in another article. Vote count:. A problem we are having is that we have acquired a new company that has overlapping IP subnets so we have had to restrict traffic to specific domain controllers in order to create the forest trust. However, here are my 2 cents based on my previous experience:. If there is a two way trust, the DC in the site were also ADFS is placed should handle authentication of remote users.
Configure multiple Office 365 tenants to use a single AD FS farm
Additionally there are some things that can be done at network level. Where that traffic should go, can be defined at load balancer leverl. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.
News Azure Dev Angular.You'll need a redundant Internet connection in each location and a stretched VLAN between the two locations. Easy to say, not so easy to setup ;- The key issue with this I recall when testing the twin farm configuration was that if your primary site and AD FS configuration was not available you could not update your O configuration.
That would be neat. We do not wish to invest in this hardware. Hence we are creating two server farms, one per AD Site. Regarding the third point you mentioned " Whether you're supporting external access or not I would recommend the use of a proxy. Again, if the risks are understood, then your solution fits your requirements. I have been trying to find some guidance on this topic I have a 3. I wanted to do some research before doing anything though since ADFS now has some hooks into the AD services container for device registration and such.
Sign in to vote.