Last week as part of the openssl heartbleed vulnerability checks, our security department ran a vulnerability check against all the HP iLOs in the firm. We are not sure what happened (they wouldn’t tell! lol), but after that scan, all of the HP iLO of the c-class and p-class series blades showed communications errors and you cannot access the iLOs after that.
HP has acknowledged that this is an issue and is working on it. Luckily it only impacted blades G6 and below (which are legacy hardware for us) and iLO and iLO2. Firmware upgrade or downgrade does not fix this issue.
The only fix for it is to shutdown the blade and reseat it, basically the iLO needs to loss power to reset this issue. Alternatively, you can telnet into the OA and reset the blade, but you are still required to shutdown your server OS first since that will reboot the blade
Telnet <OA IP address> --> you will need logon credentials In telnet prompt type "reset server <slot number>"
After that, login to the OA web gui and re-discover the blade.