What can cause 401 Unauthorized from the Channels REST API?

A 401 HTTP response from the Pusher REST API means one of the following:

  1. The credentials are incorrect
  2. The authentication signature is incorrect

The second reason can be caused by the time on the machine creating the signature being incorrect. This is because the signature is created with a timestamp. To remedy ensure the time is correct. See What does the Timestamp expired response from REST API mean when triggering an event? 

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