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Viewing a connection log

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Updated at September 21, 2026
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Warning

Yandex IoT Core is no longer available to new users.

Current users can create resources until November 1, 2026. Afterwards, the service will go read-only and cease to operate on December 1, 2026. For more information on the timing and procedure, see Service shutdown.

The log contains information about device connection and disconnection events, as well as any errors that occur. You can view connection logs for a registry and devices. The time is specified in UTC.

Viewing a registry connection log

The registry connection log shows operations performed with the registry certificate. It does not include operations performed by devices belonging to this registry.

  1. In the management console, select the folder where you want to view the registry connection log.
  2. Navigate to IoT Core.
  3. Select the registry with the device in question.
  4. Navigate to the Logs tab.

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 the 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

Viewing a device connection log

The device connection log shows operations performed with the device certificate.

  1. In the management console, select the folder where you want to view a device connection log.
  2. Navigate to IoT Core.
  3. Select the registry with the device in question.
  4. Navigate to the Devices tab.
  5. Select the device.
  6. Navigate to the Logs tab.

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 the 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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