To produce a list of trusted domains, we recommend using nltest tool. This needs to be run on a workstation on the same domain of the computer account you've specified in the EasySSO configuration (not necessarily the server that will run the EasySSO-enabled Atlassian application).
Here is the process of how to use NLTEST to test the trust relationship between a workstation and domain.
You may also want to read about Domain and Forest Trust Tools and Settings.