Error code: 40171 - No means provided to renew auth token

This will usually occur if you haven't provided an authUrl or authCallback in your clientOptions when instancing the Ably REST or Realtime library. 


Tokens have a set expiration time, and once that time has been passed the token will no longer be valid for communicating with Ably. If you make use of authUrl or authCallback, a new token will automatically be requested prior to the current one expiring, ensuring that the library can continue to operate.


Further reading: