Server 4: Cannot connect to remote server: "lost contact with the AuthService"

Attempting to upgrade to Server 4; have Server 4 app on my local Mac to administer a remote Mac mini running Server 4. Server app 4 on the mini connects to itself; however, I cannot user Server app 4 on my local Mac to connect remotely to the mini. Have verified the machine name, user, and password are all correct (they haven't changed and worked fine under Server 3.2.2). Console on the local machine shows the following error:

12/27/14 5:56:27.303 PM Server[4193]: Connected to the Auth Service

12/27/14 5:56:27.303 PM Server[4193]: authenticateToServermgrdAs: connection returned an error Error Domain=NSCocoaErrorDomain Code=4099 "Couldn’t communicate with a helper application." (The connection to service named com.apple.servermgrd.auth was invalidated.) UserInfo=0x60800047f780 {NSDebugDescription=The connection to service named com.apple.servermgrd.auth was invalidated.}

12/27/14 5:56:27.304 PM Server[4193]: We have lost contact with the AuthService we will need to reauth

Any ideas on how to troubleshoot? Thanks --