Help! DNS name changed without warning!

Hi all,
I have been trying to get my VPN to work recently to no avail. I decided to change my router's IP address 192.168.1.1 to 192.168.3.1 as I read that this may cause issues when connecting to a VPN. However, when I checked on Server Admin, I noticed that my DNS had changed from a .com to a .local.
Is there anyway to revert the DNS back to the original name?
Best,
Oli

If I understand correctly...
You force powered down the Mac with the power button, and then turned it back on again, and your wife could log in to her account without entering a password - is that correct?
It sounds like somehow her password got changed to a blank one. I've never heard of a bug that could cause this - are you sure that either of you didn't change the password to a blank one?
PS any administator's username and password can also be used to unlock another user's screen - if it happens again you can use the password of your own admin account.

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