Duplicate ClientId locating and removal

Question

Hi All

IOT core is showing that i have a duplicate clientId and so disconnects form my device

the issue is i dont know how to locate the duplicate device  
is there a way to find what the other device is ... as i only know one at this point and as the clinetid is the imei number of the modem... it cannot be changed

there are too many devices to delete and start again... so thats not an option

Answer

To find dedicated disconnects caused by a duplicate clientId you can use the following filter in CloudWatch Insights:

`filter disconnectReason = "DUPLICATE_CLIENTID"`

KR,

Philipp

Answer

Hi. The Connect and Disconnect events in CloudWatch contain both the **sourceIp** detailing the IP address of the device and the **principalId** detailing the ID of the device certificate. Assuming you have a unique certificate for each Thing, you can use the two certificate IDs to find the Thing names. You can do that on the console or on the command line:

```
aws iot list-principal-things --principal arn:aws:iot:::cert/
```

You can use Logs Insights in CloudWatch to search for all Connect and Disconnect events using the particular . You can use a filter statement like this:

```
filter clientId = '' and (eventType = 'Connect' or eventType = 'Disconnect')
```

Duplicate ClientId locating and removal

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