Its an easy thing to do from the OMS server using EMCLI, (Enterprise Manager Command Line Interface) commands. Once logged in, list_agent_property to get the target for the host and then you should be able to set_agent_property to correct the issue. Hope this helps, Kellyn Kellyn Pot'Vin Senior Technical Consultant Enkitec DBAKevlar.com RMOUG Director of Training Days Conference ~Tombez sept fois, se relever huit! On Monday, November 11, 2013 2:10 PM, Backseat DBA <backseatdba@xxxxxxxxx> wrote: We recently had to change the hostname of one of the servers my EM 12c is monitoring. What do I have to do to in EM 12c to recognize the new server name? Do I have to uninstall the agent and re-install?