Small changes in computer settings or a change in configuration with router or modem settings may result in DNS error.
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I am using Windows to manage wifi and not the Atheros client utility.
Problem: My problem is that windows explorer, the command line, a VNC client, etc..
So I have this weird issue on my DHCP server where random computers don't update the DNS records and I have to manually run ipconfig /registerdns on the client computer to force the update.
To make myself understood I'll give you this example: A computer connects to VPN, it gets an IP from another subnet, the DNS is updated accordingly.