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# Resolve connectivity issues between an iPDU and the appliance

The appliance automatically synchronizes with iPDUs when they are added, on startup of the appliance, and when it detects changes to the power connections to the iPDU. However, if an iPDU becomes out of synchronization with the appliance, you must refresh the connection manually.

### Prerequisites

- Minimum required session ID privileges: Infrastructure administrator or Server administrator

Resolving connectivity issues between an iPDU and the appliance using REST APIs
`PUT /rest/power-devices/{id}/refreshState`

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