This is a strange one
Approx midnight last night one of our routers became unreachable by monitoring software
I discovered I could log into it with admin/*blank* and there were no user accounts other than this admin one saying default
In addition, AAA/radius was turned off (though the entry in RADIUS was still there) and the custom user groups were missing
All of the other config was still there and in place, literally just the user related section was seemingly wiped out
The routers uptime was several days hence it had no rebooted, and we had successful access to it yesterday meaning all user related config was there
What the hell? I've never seen anything like this
I have seen it when a router is wiped and config is restored because it doesn't contain user account related information. However if that was the case
1) the router have rebooted if it had some kind of wipe happen to it
2) we wouldn't have anything logging into it successful in the time the router has been up. There were both local and RADIUS accounts successfully logging into it yesterday
RouterOS version is 6.44.6, device is a CCR1036-8G-2S+