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ADFS is needed in Company B. The applications in Company A must have a credential store of some sort and the application must support an authentication protocol that ADFS supports such as SAML. There are definitely a few moving pieces.
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ADFS is needed in Company B. The applications in Company A must have a credential store of some sort and the application must support an authentication protocol that ADFS supports such as SAML. There are definitely a few moving pieces.

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Does that mean if both forests are reachable I should be using trust instead of ADFS?<br />
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Also, does the ADFS server suppose to be in the internal or DMZ network?
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Does that mean if both forests are reachable I should be using trust instead of ADFS?

Also, does the ADFS server suppose to be in the internal or DMZ network?

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Need some pointing in the correct direction so that I can setup ADFS correctly.<br />
<br />
I have Company A which is hosting a bunch of applications which are using SSO for authentication. &nbsp;Now comes the new Company B, which needs access to these same application which are hosted in Company A. &nbsp;<br />
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Questions.<br />
- Is it correct for me to implement ADFS instead of AD trust?<br />
- Is it a best practice to install ADFS on a Domain Controller? &nbsp;Can I install ADFS on a member server?<br />
- If all the applications are hosted in Company A and only Company B need to access these applications do I still need ADFS running in Company A? &nbsp;Or ADFS is only required in Company B?
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Need some pointing in the correct direction so that I can setup ADFS correctly.

I have Company A which is hosting a bunch of applications which are using SSO for authentication.  Now comes the new Company B, which needs access to these same application which are hosted in Company A.  

Questions.
- Is it correct for me to implement ADFS instead of AD trust?
- Is it a best practice to install ADFS on a Domain Controller?  Can I install ADFS on a member server?
- If all the applications are hosted in Company A and only Company B need to access these applications do I still need ADFS running in Company A?  Or ADFS is only required in Company B?

ADFS Setup

Active Directory Federation Services (ADFS)

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.