Internet connection dead - DNS failing

[wdnk]

Hello, this is a question about the original Samsung firmware, but I figure you can help much faster.
Since a few (2?) days my internet connection is dead; the TV sends a DNS request to "ns11.whois.co.kr",
which fails - this fails for me as well:
-> host ns11.whois.co.kr
Host ns11.whois.co.kr not found: 3(NXDOMAIN)
But the TV now thinks that it cannot reach "the internet", and refuses to access any apps etc.

Is there a way to configure the "ns11.whois.co.kr" address?

Thanks in advance,

W.

[juusso]

If you set redirect on your router to some other (maybe google.com ) ?