# System Requirements for Access Nodes for Azure Cosmos DB for Apache Cassandra

## Operating System Requirements

Verify that your environment meets the system requirements for the access nodes. The access node must use one of the following versions of Windows Server or Linux:

- Windows Server

  - 2019
  - 2016
  - 2012

- Linux

  - CentOS 8.x, 7.x
  - Red Hat Enterprise Linux 8.x, 7.x

## Firewall Requirements

If you have network configuration enabled on the access nodes, before you deploy the Linux proxy, configure a firewall on the cloud proxy and on-premises. For more information, see Configuring a Firewall to Install the Virtual Server Agent on a Cloud VM or Instance.

To access Azure backup and restore services for the Azure regions, incorporate the following URLs in your firewall or proxy settings.

Azure | Azure China | Azure Germany | Azure US Gov
--- | --- | --- | ---
https://management.azure.com/ https://login.microsoftonline.com/ https://*.blob.core.windows.net https://*.blob.storage.azure.net https://*.vault.azure.net https://graph.windows.net/ http://169.254.169.254/metadata/identity/oauth2/token | https://management.chinacloudapi.cn/ https://login.chinacloudapi.cn/ https://*.blob.core.chinacloudapi.cn https://*.blob.storage.azure.net https://*.vault.azure.cn https://graph.chinacloudapi.cn/ http://169.254.169.254/metadata/identity/oauth2/token | https://management.microsoftazure.de/ https://login.microsoftonline.de/ https://*.blob.core.cloudapi.de https://*.blob.storage.azure.net https://*.vault.microsoftazure.de https://graph.cloudapi.de/ http://169.254.169.254/metadata/identity/oauth2/token | https://management.usgovcloudapi.net/ https://login.microsoftonline.us/ https://*.blob.core.usgovcloudapi.net https://*.blob.storage.azure.net https://*.vault.usgovcloudapi.net https://graph.windows.net/ http://169.254.169.254/metadata/identity/oauth2/token

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