Try holding the reset button on the back of the unit in for 5-8 seconds. This will reset SSH password, dashboard password, and set the network back to dhcp. The drive should reboot during this process (Pay attention to the LED)
No data will be erased from the drive.
Short of pulling the drive out of the enclosure (which would void your warranty) and debricking it with my guide the only other option is to back up your data and set up an RMA with Western Digital.
Return Merchandise Authorization. You call Western Digital, they give you an RMA# and tell you where to ship your drive. Upon receipt of your drive in their system, they send you a recertified drive back. This process can take weeks including shipping time.