> For the complete documentation index, see [llms.txt](https://docs.verifone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.verifone.com/support-nordics/v400m-integrated/how-tos/how-to-do-a-network-test.md).

# How to Do a Network Test

Run a network test on your V400M to check its connection to our payment system.

{% hint style="info" %}
**Use this when** you want to check your terminal can connect to your network and to our payment system — for example, if payments are failing or a guide asks you to run a network test.
{% endhint %}

## Run a network test

{% stepper %}
{% step %}

### Open the menu

Press **4** and **6** at the same time, then enter password **1234** and press the **green button**.
{% endstep %}

{% step %}

### Go to Run Tests

Select **Administration > Run Tests**.
{% endstep %}

{% step %}

### Run the network test

Select **Network Test** and wait for the result.

* **If the test passes:** your terminal is connected.
* **If the test fails:** see [Network Test Failed](/support-nordics/v400m-integrated/errors/network-test-failed.md).
  {% endstep %}
  {% endstepper %}

{% hint style="warning" %}
**Just installed your terminal and the test keeps failing?** For the network test to pass, **port 443** must be open on your network. Contact your network provider (for example, your internet or IT provider) to check this.
{% endhint %}

<details>

<summary>Keywords</summary>

Also called: network test, connection test, test connection, communication test. Search terms: network test, run tests, connection, port 443, network provider, administration.

</details>


---

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