yt-dlp: Niconico Channel Plus stopped working all of a sudden

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Checklist

• I’m reporting that yt-dlp is broken on a supported site
• I’ve verified that I’m running yt-dlp version 2023.10.07 (update instructions) or later (specify commit)
• I’ve checked that all provided URLs are playable in a browser with the same IP and same login details
• I’ve checked that all URLs and arguments with special characters are properly quoted or escaped
• I’ve searched known issues and the bugtracker for similar issues including closed ones. DO NOT post duplicates
• I’ve read the guidelines for opening an issue
• I’ve read about sharing account credentials and I’m willing to share it if required

Region

United States

Provide a description that is worded well enough to be understood

I just started using yt-dlp to download a couple stream archives from Niconico Channel plus today and it stopped working all of a sudden. I downloaded about 6 videos (30 gb or so). I checked to see if yt-dlp worked on a previously downloaded video (after moving it to another folder so yt-dlp doesn’t think it’s already been downloaded) and it did not work on it. So it seems like something must have changed. Is it possible I got flagged somehow for downloading around 6 or so videos in 1 day? I can still watch the streams.

Provide verbose output that clearly demonstrates the problem

• Run your yt-dlp command with -vU flag added (yt-dlp -vU <your command line>)
• If using API, add 'verbose': True to YoutubeDL params instead
• Copy the WHOLE output (starting with [debug] Command-line config) and insert it below

Complete Verbose Output

[debug] Command-line config: ['https://nicochannel.jp/soyogisetune-asmr-plus/video/sm9rU2bo9cudbwhGVEBSmRxm', '-vU', '--cookies-from-browser', 'chrome']
[debug] Extracting cookies from: "C:\Users\Mike\AppData\Local\Google\Chrome\User Data\Default\Network\Cookies"
[debug] Found local state file at "C:\Users\Mike\AppData\Local\Google\Chrome\User Data\Local State"
[debug] cookie version breakdown: {'v10': 3211, 'other': 0, 'unencrypted': 0}
[debug] Encodings: locale cp932, fs utf-8, pref cp932, out cp932 (No VT), error utf-8, screen cp932 (No VT)
[debug] yt-dlp version nightly@2023.10.09.183051 [84e26038d] (win_exe)
[debug] Python 3.8.10 (CPython AMD64 64bit) - Windows-10-10.0.19045-SP0 (OpenSSL 1.1.1k  25 Mar 2021)
[debug] exe versions: ffmpeg n6.0-34-g3d5edb89e7-20230810 (setts), ffprobe n6.0-34-g3d5edb89e7-20230810
[debug] Optional libraries: Cryptodome-3.19.0, brotli-1.1.0, certifi-2023.07.22, mutagen-1.47.0, sqlite3-3.35.5, websockets-11.0.3
[debug] Proxy map: {}
[debug] Loaded 1887 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp-nightly-builds/releases/latest
[debug] [NiconicoChannelPlus] sm9rU2bo9cudbwhGVEBSmRxm: video_type=vod, live_status=not_live
ERROR: [NiconicoChannelPlus] Unable to get session id: HTTP Error 403: Forbidden (caused by <HTTPError 403: Forbidden>); please report this issue on  https://github.com/yt-dlp/yt-dlp/issues?q= , filling out the appropriate issue template. Confirm you are on the latest version using  yt-dlp -U
  File "yt_dlp\extractor\common.py", line 715, in extract
  File "yt_dlp\extractor\niconicochannelplus.py", line 110, in _real_extract
  File "yt_dlp\extractor\niconicochannelplus.py", line 220, in _get_live_status_and_session_id
  File "yt_dlp\extractor\niconicochannelplus.py", line 22, in _call_api
  File "yt_dlp\extractor\common.py", line 1069, in download_content
  File "yt_dlp\extractor\common.py", line 1033, in download_handle
  File "yt_dlp\extractor\common.py", line 903, in _download_webpage_handle
  File "yt_dlp\extractor\common.py", line 860, in _request_webpage

  File "yt_dlp\networking\_urllib.py", line 410, in _send
  File "urllib\request.py", line 531, in open
  File "urllib\request.py", line 640, in http_response
  File "urllib\request.py", line 569, in error
  File "urllib\request.py", line 502, in _call_chain
  File "urllib\request.py", line 649, in http_error_default
urllib.error.HTTPError: HTTP Error 403: Forbidden

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "yt_dlp\YoutubeDL.py", line 4051, in urlopen
  File "yt_dlp\networking\common.py", line 114, in send
  File "yt_dlp\networking\_helper.py", line 204, in wrapper
  File "yt_dlp\networking\common.py", line 325, in send
  File "yt_dlp\networking\_urllib.py", line 415, in _send
yt_dlp.networking.exceptions.HTTPError: HTTP Error 403: Forbidden

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "yt_dlp\extractor\common.py", line 847, in _request_webpage
  File "yt_dlp\YoutubeDL.py", line 4070, in urlopen
yt_dlp.networking.exceptions._CompatHTTPError: HTTP Error 403: Forbidden