PubSub Websocket: "AMQJS0008I Socket closed." when trying to subscribe

Describe the bug I followed the tutorial to create Auth for my React App, then I followed the tutorial on using PubSub with AWS IoT. The first Problem I encountered was that using the pubsub endpoint: wss://xxxxxxx-iot.eu-central-1.amazonaws.com/mqtt resulted in a “legancy certificate error” (I am using chrome) so i replaced the endpoint with wss://xxxxxxx-ats.iot.eu-central-1.amazonaws.com/mqtt. Now as soon as I try to subscribe I get the following error: {invocationContext: undefined, errorCode: 8, errorMessage: "AMQJS0008I Socket closed."}

I have attached the Policy using the command from the tutorial, but since attach-principal-policy is deprecated I also tried: aws iot attach-policy --policy-name 'myIOTPolicy' --target 'eu-central-1:xxxxxxxxxxxxxxxxxxx'

To Reproduce

1. Follow all the steps from the tutorial for setting up a react app, adding auth and using PubSub. Expected behavior A clear and concise description of what you expected to happen.

Desktop (please complete the following information):

• OS: WSL
• Browser Chrome
• Version 71.0.3578.98

This might be just an issue with the documentation

[1f47a]

I was able to resolve this error by attaching the AWSIoTDataAccess policy to the Cognito AuthRole

[Cayce]

Had the same error, changing IOT Core policy solved the problem for me:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "iot:*",
      (NOT WORKS) "Resource": "arn:aws:iot:us-west-2:XXXXXXXX/*"
      (WORKS) "Resource": "*"
    }
  ]
}

My guess is that previous policy gave permission to subscribe/publish to topics, but didn’t gave the permission to connect. Amplify JS PubSub docs can be improved IMHO.