Using Windows application from Buffalo website I discovered that my NAS is currently in emergency mode (em mode). Description of which can be located at http://buffalo.nas-central.org/wiki/EM_Mode
Windows application is able to find the device but the updating software does not. I tried to change mode into debug and force the update but it does not even locate the device.
I have also disable the firewall but this made no difference.
I opened UDP-Port 22936 on the router but this make no difference as well.
I do not know what else to try any suggestions?