You have HP DL Series computer such as DL150. You did purchase and installed the KVM license key, it did work but now whenever you connect you get
"Invalid username/password. You have been disconnected"
ssh as an admin into the ILO interface. For most cases you should use putty program which is free and downloadable.
Then type in the following commands:
show map1 license
Session will then hang, just kill the ssh program.
Log back into the web utility and the KVM feature should now work.