# Why isn't my model connecting to standalone?

## Question

Why isn't my specific device model connecting, while other models work?

## Answer

If you have a specific device model that won't connect to your platform (for example, Teltonika), while other models work, the most likely cause is a closed port.

Example: Teltonika typically uses port **47776**.

Verify from an external host:

`nc -zv your_domain.com 47776`

Open the required port, then retest.

For a full list of ports, search for the device model on the device list page.

## Links

* [Device list (ports)](https://www.navixy.com/devices/)
* [Network](/docs/on-premise/on-premise/how-to-guide/requirements/network.md)
* [Device activation network](/docs/on-premise/on-premise/how-to-guide/troubleshooting/device-activation.md#network)


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