http://www.rebeladmin.com/2015/02/configuring-trusts-part-4/ This is the last part of the series which explain about “Trusts” between infrastructures. If you not checked the other 3 parts yet you can find them in here. Configuring Trusts – Part 1 Configuring Trusts – Part 2 Configuring Trusts – Part 3 This article will explain how to configure trusts between infrastructures. Demo Setup For the demonstration I will be using following setup. Organization Domain Primary DC Contoso Ltd. Contoso.com Microsoft Windows Server 2012 R2 XYZ Ltd. Xyz.com Microsoft Windows Server 2012 R2 I am going to initiate a “Forest Trust” between the 2 organizations. It will be Two-Way trust which allows each forest, domains and users to access “allowed” resources in each organization infrastructure. Before start the process the initial step is to make sure following ports are open in firewalls in both organizations to initiate the trusts. UDP Port 88 – Kerbero...