Oracle ILOM versions 3.0.9 and earlier have limitations that might cause the ilomconfig command to fail with the error Cannot connect to BMC. These errors can occur when multiple programs attempt to access the IPMI interface of Oracle ILOM.
If such errors do occur, Oracle ILOM must recover from this error. This recovery could mean a one or two minute disruption in the services provided by Oracle ILOM.
Workaround
To help avoid this error, disable the Hardware Management Agent and Storage Monitoring Agent before using ilomconfig. Also, avoid any other IPMI access to Oracle ILOM, such as using ipmitool, when running ilomconfig.