'Name of service not known' when used with tv.nrk.no

[ardevd]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.06.11. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2018.06.11

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• [x ] At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
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• Feature request (request for a new functionality)
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When downloading a video clip from https://tv.nrk.no I get a Name or service not known error.

youtube-dl -v https://tv.nrk.no/serie/sangfoni/MSUS49000916/sesong-2/episode-9
[debug] System config: ['--prefer-free-formats']
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://tv.nrk.no/serie/sangfoni/MSUS49000916/sesong-2/episode-9']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.05.18
[debug] Python version 3.6.5 (CPython) - Linux-4.16.14-300.fc28.x86_64-x86_64-with-fedora-28-Twenty_Eight
[debug] exe versions: none
[debug] Proxy map: {}
[debug] Using fake IP 84.215.48.165 (NO) as X-Forwarded-For.
[NRKTV] MSUS49000916: Downloading mediaelement JSON
ERROR: Unable to download JSON metadata: <urlopen error [Errno -2] Name or service not known> (caused by URLError(gaierror(-2, 'Name or service not known'),))
  File "/usr/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 582, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/usr/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 2210, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib64/python3.6/urllib/request.py", line 526, in open
    response = self._open(req, data)
  File "/usr/lib64/python3.6/urllib/request.py", line 544, in _open
    '_open', req)
  File "/usr/lib64/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.6/site-packages/youtube_dl/utils.py", line 944, in http_open
    req)
  File "/usr/lib64/python3.6/urllib/request.py", line 1320, in do_open
    raise URLError(err)

Also, fyi.

# youtube-dl --version
2018.06.11

The issue seems to affect all content on NRK's web based platform.