Multiple Active Directory Domains
If an organization has multiple Active Directory domains or adds a new domain to the organization’s Active Directory infrastructure, those additional domains are not automatically discovered by K2 or appear in the K2 Management site. K2 adds a Default Domain based on the domain of the account used to install K2. You must add, edited and delete additional domains manually, using the K2 Management Site, see the Domains topic in the K2 Five User Guide for more information.
If you have a multi-domain environment and you have installation blocking authentication errors while installing K2, see the troubleshooting topic Authentication issues when installing K2 in multi-domain environments