# Limit authorization

In this case study, we will look at how to set authorization (user) limits on a modem.

To configure authorization (user) limits on the modem, perform the following steps:

1. Get a list of your modems and select one of them. You can get a list of modems [`by host`](https://docs.proxy-seller.com/mobile-crm/usage-guides/host-actions/list-of-host-modems) or [`without host`](https://docs.proxy-seller.com/mobile-crm/usage-guides/modem-actions/get-all-modems).
2. we will need a unique authorization identifier, which we can [`get here`](https://docs.proxy-seller.com/mobile-crm/usage-guides/modem-authorization-users/modem-authorizations). And select some of them.
3. Use the following method from our API [`Create proxy limit for modem authorization`](https://docs.proxy-seller.com/api-reference/proxy-limit#create-proxy-limit-for-modem-authorization)

{% hint style="info" %}
You can set limits on one or more authorizations on the modem at the same time
{% endhint %}

{% hint style="danger" %}
Attention: setting at least one limit on the modem authorization will reset the modem limit setting, if it is set.
{% endhint %}

Example of successful execution of a request in JSON format:

```json
{
  "failedModemAuths": []
}
```