WHen you asked me if server name was changed executed couple Unix Commands and here what I found. Not sure if this could make OEM not to work

#nslookup
Name: orc-prod.gilbarco.com
Address: 10.28.13.5

#hostname
oracle_prd

See how hast name has underscore and nslookup desh (oracle_prd vs orc-prod.gilbarco.com)

would not nslookup have underscore just like server name ?