Can you check IP block setting on iDRAC. You can check the setting on "iDRAC Settings -> Network -> Advanced Settings" page of iDRAC GUI. By default iDRAC IP will be blocked for 10 minutes from the client if you type wrong password 3 times in 60 seconds. You will be able to access iDRAC from different client during this time. You can access iDRAC from same client after the Penality time defined in the setting.
Our system has some new R720 servers with iDrac7 Enterprise. Today, I noticed that the iDrac7's IP didn't respond (cannot ping, ssh, web GUI...) after three fail logins in the Web GUI (I typed wrong password). I had to unplug the power cord to reset the iDrac and access it again. The factory iDrac firmware is 1.57.57. I've tried to upgrade to lastest 1.66.65 but can not solve problem. So how can I solve it? Regards,
iDrac7 not responding after some failed logins