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Best practices for securing Windows Server-based Lightsail instances

Last updated: October 16, 2017

In this article, we provide tips and tricks to help you avoid security risks when using your Lightsail instance running Windows Server.

About Lightsail passwords

When you create a Windows Server-based instance, Lightsail randomly generates a long password that is hard to guess. You use this password uniquely with your new instance. You can use the default password to connect quickly to your instance using remote desktop (RDP). You are always logged in as the Administrator on your Lightsail instance.

Managing your password

You can change the password on your Windows Server-based instance. This might be useful if you want to use a remote desktop client to access your Lightsail instance. Lightsail never stores a password you generate.


You can use either the Lightsail-generated password or your own custom password with the browser-based RDP client in Lightsail. If you use a custom password, you will be prompted for your password every time you log in. It's easier to use the Lightsail-generated default password with the browser-based RDP client if you want quick access to your instance.

Use the Windows Server password manager to change your password securely. Press Ctrl + Alt + Del, and then choose Change a password. Be sure to keep a record of your password, because Lightsail doesn't store your password. If you need to retrieve your password, see the following: Using the non-default key with Windows-based Lightsail instances.

If you change your password from the unique, default password, be sure to use a strong password. You should avoid passwords that are based on names or dictionary words, or repeating sequences of characters.

Security patching

We recommend keeping your Windows Server-based Lightsail instances updated with the latest security patches. Be sure your server is configured to download and install updates. The following procedure tells you how to do this directly on your Lightsail instance running Windows Server.

  1. On your Windows Server-based instance, open a command prompt.

  2. Type sconfig, and then press Enter.

    Windows Update Settings (number 5) are at Automatic by default.

    Server configuration in Windows Server 2016
  3. To download and install new updates, type 6, and then press Enter.

  4. Type A to search for (A)ll updates in the new command window, and then press Enter.

  5. Type A again to install (A)ll updates, and then press Enter.

    When finished, you see a message with the installation results and more instructions (if those apply).

    Successfully downloaded and updated Windows Server 2016 security patch

Enabling Account Lockout Policy in Windows Server

You can configure Windows Server to temporarily or indefinitely disable accounts when a certain number of unsuccessful login attempts has been reached. For example, you can lock out someone who attempts to log in to your instance using three unsuccessful passwords.

For more information, see Account Lockout Policy in the Windows Server documentation.

Ports and firewall settings

By default, we open the following ports on your Windows Server-based instances.

Firewall settings

The ports you enable are exposed to the world and can't be restricted by source IP. To restrict access to your instance, you can turn off these ports and only enable them when you need to access your instance. Here's how:

  1. Find the instance you want to manage in Lightsail, and then choose Manage.

  2. Choose Networking.

  3. On the Networking page for your instance, choose Edit rules.

  4. Delete the RDP/TCP/3389 rule by choosing the orange "x" next to the rule.

    Close your RDP port by deleting this rule
  5. Choose Save.