Please verify that the BESA has the correct rights/permissions on the problematic DC.. See the following document
http://www.symantec.com/docs/TECH184449
When you push a remote agent to a machine the trust is automatically if you manually install the agent it will be required that you establish the trust. According to the error that you screen shoted it would appear that you might have incorrectly entered your logon credentials. Please verify that you are infact using the correct admin credentials... log out of the media server and then try logging in with the credentials that you are trying to establish a trust with. Additionally be sure to verify that the credentials being used DO have the rights that are being flagged in the error.