Please send us a screenshot of what connection details you have given while running the job from spoon. You need to give same User name, Password, AR server name and Port also with which he can connect to that AR server via user tool or mid-tier.
Also with same login details which you are using while running a job from spoon, open any of the OutPut step, and within connection, where currently 'AR Server' is given, there try creating new connection and within that give server name, login credentials whatever details you are giving while running the job and click on 'Test' and see if that is successful.
Please let me know if you have any problem we can schedule a webex to check all these .