HI
Could you please check this
1) Ping to the mgmt IP from the PC and run "monitor traffic interface me0 no-resolve" and see if ICMP packets are coming in.
2) Also get the output of show route.
3) Can you check the cpu occupancy.
4) show log messages | match me
5) show interfaces terse | match inet
6) Ping from the box itself to its own IP.
Thanks
Partha