In particular, occurring in the following course.
https://www.memrise.com/course/46/1000-words-of-elementary-german
For instance, there are two audio records for the word “die Möglichkeit”.
http://static.memrise.com/uploads/audio/32111218124659_711190_0b1c3.mp3
http://static.memrise.com/uploads/audio/48200120107094057_711190_0b96d.mp3
The second one works, but for the first one won’t play.
The web-server’s response is
403 Forbidden
Content-Type: application/xml
Transfer-Encoding: chunked
Connection: keep-alive
Date: Wed, 03 Jan 2018 21:51:34 GMT
Server: AmazonS3
X-Cache: Error from cloudfront
Via: 1.1 85c8f2e63c405fa7a2374a7644319cce.cloudfront.net (CloudFront)
X-Amz-Cf-Id: RJEZYrEEGVvF0vsCYrHF5xd_SewyVtedboOzKPZJ4MajafaQPOnP8A==
<?xml version="1.0" encoding="UTF-8"?>
<Error><Code>AccessDenied</Code><Message>Access Denied</Message><RequestId>4507463F51EDE4BC</RequestId><HostId>Bq9U5GR+uQ5uCBedQm6523f2NkiPscldTWI0EZp4MpVqgRINW3vPDiFsCr0LCcF4/VOPD6Q5068=</HostId></Error>
I’m on macOS High Sierra 10.13.2, Firefox 57.0.3 (64-bit), but I don’t think that matters.