Errno -2: Name or service not known (AWS IoT Sitewise)

Question

I followed step by step the tutotrial https://docs.aws.amazon.com/iot-sitewise/latest/userguide/ingest-data-from-iot-things.html but when I tried to do the **step 8** of section "**Running the device client scrip**" I received the error "Errno -2: Name or service not known". Apparently the problem is in **mqttClient.connect()**, but I haven't been able to fix it in a long time. Any help is welcome! Thanks!

Answer

Hi,

it looks like the AWS IoT endpoint which you pass with `-e` command line parameter is not resolvable. The iot endpoint looks similar to `abcdefgh012345-ats.iot.AWS_REGION.amazonaws.com`.

You can retrieve your endpoint for example with the AWS CLI:
```
aws iot describe-endpoint --endpoint-type iot:Data-ATS --query 'endpointAddress' --output text
```
You can also validate if you can resolve your endpoint in DNS.

Cheers,  
Philipp

Errno -2: Name or service not known (AWS IoT Sitewise)

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