We came across this issue today, where we were unable to access a Servers ILO due to someone leaving the remote console session open.
The following error was displayed
Remote Console is unavailable. It is already in use by a different client
We needed to access the servers ILO pretty quickly, so we had to end the other users ILO remote control session.
To do this do the following.
1, Go to System Status on the homepage and select diagnostics

2, Now press reset which will reset all connections to the ILO and then enable you to access the remote console on the ILO
Daniel Davies
You may come across this issue if you have the “HP System Homepage” configured on your server. Basically when you open the system homepage you expect to see NIC, Power, System, Processor , temperature information etc.
However you are seeing no information and the System Model is showing as unknown.

We came across this issue to the resolution for this was to change the security settings of the SNMP Service to the same as the below screenshot.
SNMP SETTINGS
Public – Read Only
You do this by going into the properties of the SNMP Service and going to the security tab and simply adding the name in.

Once you have edited the security settings you will need to restart the SNMP service and your homepage should be working for you.
Thank You
Daniel Davies
It appears there are some incompatibilities with recently released critical update kb948496. The symptoms manifest themselves as intermittent connectivity and throughput issues, once the update has been installed and the server restarted.
We are advising customers to ensure that HP NIC drivers are up to date prior to installing this update.