Yes. If you are having problems adding agents to your master when they are in different domains, I have found two ways to fix this.
1. On the master, add the agent server's domain to the "Append these DNS suffixes" box in the advanced TCP/IP settings under the Local Area Connection Properties.
2. In the Tidal console, open the Connection Definition box for the problem agent, click the Connection tab, and in the Machine Name field, enter the fully qualified server name, for example: server01.companyname.com. Also make sure that there is no firewall blocking traffic on port 5912 between the two domains.
Hope that helps!