Hi,
I read too late about this issue with the RB4011, management access locking up at random times. By too late, I mean after I had bought mine and put it into service. Since there seems to be a complete mystery about the underlying cause, I just hoped I'd got lucky as mine has been running since October. However yesterday it hit me, no management access via Winbox, web, SSH or telnet. SNMP continued to work. As others have found the only resolution was to power cycle.
Has there been any update on this issue? Currently running v6.47.4 ROS and firmware.
Thanks, Tony S