> ## Documentation Index
> Fetch the complete documentation index at: https://levelblue-final.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# USM Appliance Connections

To add a USM Appliance deployment connection to a USM Central instance, you must initiate a connection from the USM Appliance web UI. The connection request from a USM Appliance deployment requires a token that you generate in the USM Central instance.

> [!WARNING]
>
> Version 5.4.3 or later is required to add a USM Appliance deployment connection. Port 443 must be open between a USM Appliance and a USM Central instance.

**To generate a token for a USM Appliance connection**

1. In USM Central, go to **Settings > Deployments**.

2. Click **Connect to Existing Deployment**.

   The Connect to Existing Deployment dialog box opens.

   ![](https://mintcdn.com/levelblue-final/DOFwKl5rUbJFwqoB/images/usm-central/connectexistingdeployment_thumb_0_60.webp?fit=max\&auto=format\&n=DOFwKl5rUbJFwqoB\&q=85\&s=d2e982dc9346ae78fe8b0bd039ac238c)

3. Click the ![](https://mintcdn.com/levelblue-final/bPDl8XLOsO3r1x9k/images/usm-central/plus-square-o.svg?fit=max\&auto=format\&n=bPDl8XLOsO3r1x9k\&q=85\&s=433bcb5cc62a6e0d0789b77838daa5a9) icon next to USM Appliance.

4. Enter a name for the deployment that you want to connect.

5. Click **Generate Token**.

6. Click the ![](https://mintcdn.com/levelblue-final/bPDl8XLOsO3r1x9k/images/usm-central/files-o.svg?fit=max\&auto=format\&n=bPDl8XLOsO3r1x9k\&q=85\&s=a07b4225ea8686f2afa3ee757fa6d83d) icon to copy the token to your clipboard.

   ![](https://mintcdn.com/levelblue-final/bPDl8XLOsO3r1x9k/images/usm-central/generatetoken_thumb_0_60.webp?fit=max\&auto=format\&n=bPDl8XLOsO3r1x9k\&q=85\&s=b1dc60be51aa6f41482daa0fcf2c4306)

7. Paste the token into a secured file and send it to the user that is responsible for the USM Appliance deployment.

8. Click **Got it, close**.

**To initiate a connection to USM Central from USM Appliance**

1. In the USM Appliance web UI, go to **Configuration > Deployment > Components > Servers**.

2. Click the **Connect to USM Central** link.

3. Enter the token generated from USM Central.

   ![](https://mintcdn.com/levelblue-final/DOFwKl5rUbJFwqoB/images/usm-central/applianceconnecttocentral_thumb_0_60.webp?fit=max\&auto=format\&n=DOFwKl5rUbJFwqoB\&q=85\&s=45f59eb1662079afbdea2ecb2fa2625f)

4. Click **Connect**.

   The system sends a request to the USM Central.

   Upon acceptance, your USM Appliance deployment is automatically connected.

[https://player.vimeo.com/video/237640542](https://player.vimeo.com/video/237640542)

To view other related training videos, [click here](https://cybersecurity.att.com/training/self-paced-training).

## Disconnect a Connection

USM Appliance and USM Central enable you the option of disconnecting a connection.

**To disconnect a connection from the USM Central web UI**

1. Go to **Settings > Deployments**.

2. Click the ![](https://mintcdn.com/levelblue-final/OSGozCaHsL0BDQ3k/images/usm-central/unlink-old.svg?fit=max\&auto=format\&n=OSGozCaHsL0BDQ3k\&q=85\&s=27d490b47a3e76956e0127c4fba34efd) icon.

   The Disconnect Deployment dialog box opens.

   ![](https://mintcdn.com/levelblue-final/bPDl8XLOsO3r1x9k/images/usm-central/disconnectdeployment_thumb_0_60.webp?fit=max\&auto=format\&n=bPDl8XLOsO3r1x9k\&q=85\&s=e9ea9b4de762f6a64ffbbb61e858fd56)

3. Choose one of these options:

   * **Yes, disconnect deployment and purge all data**: Use this option to disconnect the deployment and purge all historical data.
   * **Yes, disconnect deployment BUT DO NOT purge all data**: Use this option to disconnect the deployment. Alarms remain and your USM Anywhere shows them in the alarm list. The alarms are available if you connect the deployment again.
   * **No, do not disconnect**: Use this option to exit this dialog box without disconnecting the deployment.

**To disconnect a connection from the USM Appliance web UI**

1. In the USM Appliance web UI, go to **Configuration > Deployment > Components > Servers**.

   ![](https://mintcdn.com/levelblue-final/bPDl8XLOsO3r1x9k/images/usm-central/licenseinfo_thumb_0_60.webp?fit=max\&auto=format\&n=bPDl8XLOsO3r1x9k\&q=85\&s=bdaee181313fee518a36e0f9bef4744b)

2. Click **Disable Connection**.

   The Connection to USM Central dialog box opens.

   ![](https://mintcdn.com/levelblue-final/DOFwKl5rUbJFwqoB/images/usm-central/appliancedisableconnection_thumb_0_60.webp?fit=max\&auto=format\&n=DOFwKl5rUbJFwqoB\&q=85\&s=f9e41d71c07a5af0e1c6580cd7fa4fd5)

   A dialog box opens.

   ![](https://mintcdn.com/levelblue-final/DOFwKl5rUbJFwqoB/images/usm-central/applianceyesdisconnect_thumb_0_60.webp?fit=max\&auto=format\&n=DOFwKl5rUbJFwqoB\&q=85\&s=ffd4d85396d9c7193b34f1102ba4a998)

3. Click **Yes, Disconnect**.