# System Requirements for Access Nodes for Azure Cosmos DB for MongoDB

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

  - 2022
  - 2019
  - 2016

- Linux

  - CentOS 8.x
  - Red Hat Enterprise Linux 9.x, 8.x, 7.x

Note

- 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.

- The access node must have outbound port 10255 open.

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