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Viewing the connection log

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Updated at May 14, 2026

The log contains information about connecting/disconnecting devices and errors. You can view connection logs for the registry and devices. Time is specified in UTC.

View the registry connection log

The registry connection log contains information about operations performed with the registry certificate. Operations of devices that belong to this registry are not included in this log.

  1. In the management console, select the folder to view the registry connection log in.
  2. Go to IoT Core.
  3. Select the registry with the required device from the list.
  4. Select Logs in the left pane of the window.

When viewing the log, you can set a specific time interval using the --since and --until flags. If you do not specify a time interval, the log will show info for the last hour.

Using flags:

  • --since: Time N and later.

  • --until: Time N and earlier.

If you only specify a single flag, you will see info for one hour before or after time N, depending on the flag.

You can use one of these time formats:

  • HH:MM:SS, e.g., 15:04:05.

  • RFC-3339, e.g., 2006-01-02T15:04:05Z, 2h, or 3h30m ago.

If you do not have the Yandex Cloud CLI yet, install and initialize it.

The folder used by default is the one specified when creating the CLI profile. To change the default folder, use the yc config set folder-id <folder_ID> command. You can also specify a different folder for any command using --folder-name or --folder-id. If you access a resource by its name, the search will be limited to the default folder. If you access a resource by its ID, the search will be global, i.e., through all folders based on access permissions.

  1. Get a list of registries in a folder.

  2. View the registry connection log:

    yc iot registry logs my-registry

    Result:

    2019-09-19 18:51:02     connected, cert: "94ea0421199ec70f1f3d359a1c167a81********", address: "77.88.**.***:53171", clientID: "YCCmdLine"
2019-09-19 18:51:02     some of subscriptions failed: not allowed to subscribe: ["$device/areqjd6un3af********/events"]
2019-09-19 18:52:30     disconnected: client disconnected
2019-09-19 18:52:36     connected, cert: "94ea0421199ec70f1f3d359a1c167a81********", address: "77.88.**.***:53198", clientID: "YCCmdLine"
2019-09-19 18:52:36     some of subscriptions failed: not allowed to subscribe: ["$device/areqjd6un3af********/events"]
2019-09-19 18:52:54     disconnected: client disconnected
2019-09-19 18:52:58     connected, cert: "94ea0421199ec70f1f3d359a1c167a81********", address: "77.88.**.***:53209", clientID: "YCCmdLine"
2019-09-19 18:53:32     disconnected: client disconnected

View the device connection log

The device connection log contains information about operations performed with the device certificate.

  1. In the management console, select the folder to view the device connection log in.
  2. Go to IoT Core.
  3. Select the registry with the required device from the list.
  4. Select Devices in the left pane of the window.
  5. Select the device from the list.
  6. Select Logs in the left pane of the window.

When viewing the log, you can set a specific time interval using the --since and --until flags. If you do not specify a time interval, the log will show info for the last hour.

Using flags:

  • --since: Time N and later.

  • --until: Time N and earlier.

If you only specify a single flag, you will see info for one hour before or after time N, depending on the flag.

You can use one of these time formats:

  • HH:MM:SS, e.g., 15:04:05.

  • RFC-3339, e.g., 2006-01-02T15:04:05Z, 2h, or 3h30m ago.

If you do not have the Yandex Cloud CLI yet, install and initialize it.

The folder used by default is the one specified when creating the CLI profile. To change the default folder, use the yc config set folder-id <folder_ID> command. You can also specify a different folder for any command using --folder-name or --folder-id. If you access a resource by its name, the search will be limited to the default folder. If you access a resource by its ID, the search will be global, i.e., through all folders based on access permissions.

  1. Get a list of devices in a registry.

  2. View the device connection log:

    yc iot devices logs my-device

    Result:

    2019-09-19 18:52:03     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53189", clientID: "YCCmdLine"
2019-09-19 18:52:03     disconnected: publish to topic "$device/areqjd6un3af********/events" not allowed
2019-09-19 18:52:38     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53201", clientID: "YCCmdLine"
2019-09-19 18:52:38     disconnected: publish to topic "$device/areqjd6un3af********/events" not allowed
2019-09-19 18:52:51     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53206", clientID: "YCCmdLine"
2019-09-19 18:52:51     disconnected: client disconnected
2019-09-19 18:53:01     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53213", clientID: "YCCmdLine"
2019-09-19 18:53:01     disconnected: client disconnected
2019-09-19 18:53:03     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53217", clientID: "YCCmdLine"
2019-09-19 18:53:03     disconnected: client disconnected
2019-09-19 18:53:04     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53220", clientID: "YCCmdLine"
2019-09-19 18:53:04     disconnected: client disconnected
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