Go into your router (if you can) and turn DHCP Server back ON, then reboot your hda, when on do:
And then restart again after that has completed, let your hda boot up, turn DHCP Server back OFF on your router and reboot your hda once more.
If you cannot get to your router, do a hard reset on it so set it back to factory settings, and then start from there.
What I like to do is, set it up like I would have it set up WITHOUT Amahi and save (backup) the configuration, that way its easy to go back if needed.