The front LED was flashing yellow. The server was operating normally.

Looking at he iDRAC web page it shows a critical error - Watchdog has expired. iDRAC web page stopped working. I was able to use the racadm command to reset the iDRAC. The yellow light stopped flashing. A few minutes later it started flashing again and the web interface was not working. The cli shows the following status:

Watchdog Information:

Recovery Action         = None

Present countdown value = 0 seconds

Initial countdown value = 480 seconds

So the watchdog is counting down to zero and the iDRAC web interface is not working.  Any suggestions?