Security best practices

Skytap Cloud has a number of default security features that control access across your account and virtual machines. In addition to these default security controls, Skytap Cloud also has a wide-range of optional security features that can be implemented at the account, user, and environment level. This guide provides some best practices for using these features.


Some of the steps in this article must be performed by an account administrator.

Security overview

By default, Skytap Cloud implements the following security controls:

  • Each customer’s account is completely segregated from other customer accounts. There are no shared resources, and no other customer can see resources in your account.
  • Each user has a unique login with an assigned permission level. We have multiple permission levels so that you can set the right level of access for each user within your account. Additionally, access to specific Skytap Cloud resources can be set with granular controls via the projects feature. For more information, see Sharing resources with projects.
  • Each virtual environment is isolated from other environments. One or more networks can be created within an environment, but the networks are isolated from other Skytap Cloud or external networks by default. Network connectivity to external networks, other Skytap Cloud environments, or the public Internet must be explicitly enabled.
  • Each Skytap Cloud environment is owned by a specific user. The environment is not shared unless that user grants permission to another user or set of users through projects.
  • Actions within Skytap Cloud are audited. Account administrators can review an audit trail of these actions, which ensures accountability for all users in your account.
  • Skytap Cloud follows security best practices and standards for developing and operating the Skytap Cloud platform. This includes:

    • Acquiring third-party security certifications. For more information, see
    • Performing routine penetration tests and vulnerability scans.
    • Performing background checks on personnel who have access to service infrastructure.
    • Requiring formal authorization or tickets for accessing service infrastructure.
    • Logging access to service infrastructure, and retaining those logs for at least 90 days.

Best practices for account security

Skytap Cloud requires each user to have a unique login. Administrators can further restrict account access with the following options and settings:

  • Use single sign-on (SSO) with two-factor authentication.

    Skytap Cloud supports single sign-on utilizing SAML 2.0. With SSO, users can access Skytap Cloud using their corporate directory credentials and applications such as Microsoft Active Directory Federation Services or Ping Identity’s PingFederate. You can further secure your account by implementing a two-factor authentication solution that integrates with your SSO solution. For more information, see Using Single Sign-on (SSO).

  • If you are not using SSO, set a strict password policy for your Skytap Cloud account.

    Using the settings described at Managing passwords and password policies, apply the most restrictive password policy for your users:

    • Set your user passwords to expire in 30 days. Choose the option to enforce a password history; this will require users to set unique passwords.
    • Require a minimum password length of 10 characters.
    • Set a low number of maximum invalid login attempts and a long lockout effective period; this will help protect your account against brute force login attempts.
    • Set a short session expiration time so that your users do not stay logged in during periods of inactivity.
  • Use IP-based access controls.

    You can limit access to your account based on a user’s inbound IP address. This can be useful for restricting access to Skytap Cloud from users on your corporate network. You can extend these settings so that they are applied to access via SmartRDP and sharing portals, as well. To set IP address restrictions, see Setting access policies. For more information about SmartRDP and sharing portals, see Accessing VMs with SmartRDP and Sharing VMs and environments with sharing portals.

  • Require API tokens for API access.

    API tokens are long, randomly-generated character strings that are difficult to guess. They can be reset by administrators and changed independently of account passwords. To require API tokens for API authentication, see Setting access policies.

Best practices for user management

In addition to restricting how users access Skytap Cloud, you can limit the access that your users have once they are logged in. We recommend that you use the following best practices for managing and monitoring users:

  • Grant each user the least amount of privilege necessary for his or her role.

    For example, if a user only needs to run or view an environment, administrators can set his or her user role as restricted user. For an overview of user roles and permission levels, see User roles and access permissions.

  • Use the projects feature to further restrict user access to specific environments, templates, or assets.

    Projects allow you to share resources with select users in your account. While this is a great collaborative feature, you can also use projects to limit a user’s permission over environments. For example, if you want users to be able to view, but not run, a set of environments, you can create a new project, assign the user a Viewer role in the project, and then add the set of environments to the project. Users can be assigned to multiple projects where they can have different permissions over different environments. For more information about projects and project roles, see Sharing resources with projects.

  • Routinely review your auditing reports.

    This gives administrators visibility over the account. For more information about viewing auditing reports, see Generating audit reports.

Best practices for securely accessing VMs and environments

Skytap Cloud offers several methods you can use to access your VMs. The most secure access methods are provided by default: our Secure Remote Access (SRA) browser client and SmartRDP. If security is your highest priority, we recommend that you only use these connection methods. They provide access to your VMs over the Skytap Cloud infrastructure, without exposing ports or access methods to the public Internet.

If you would like to use other access methods to share your VMs with clients or other users, we recommend the following in order from more secure to less secure:

  • Sharing portals – Sharing portals are unique URLs that grant access to a specific Skytap Cloud VM or environment. Sharing portals allow you to share VM access with other users, even if they do not have an account in Skytap Cloud. They contain a set of features that you can use to restrict access; we recommend that you use these settings to tightly control when and how your sharing portal can be used.

    For example:

    • Provide access to only the select VMs that the user needs (rather than provide access to the entire environment).
    • Limit the user’s ability to use or control the VM.
    • Require a password of at least 10 characters, or use SSO to restrict access.
    • Disable SmartRDP access, unless needed.
    • Set a runtime limit, expiration date, and/or date/time restrictions to limit access and validity duration of the sharing portal.

    For more information, see Sharing VMs and environments with sharing portals.

  • Published Services – Published services are generally used to permit Internet access to specific VMs via protocols like RDP and SSH. By creating a published service, you open a single port between on the VM (for example, 3389); this is translated to a higher port opening that is exposed on the public Internet (for example, 31299). Although Skytap Cloud obscures the specific port that is open, a published service exposes the VM to the public Internet. If you create a published service, we recommend that you take additional precautions to protect your VM. For more information, see Securing VMs exposed to the public internet.

  • Public IP addresses – Public IP addresses provide complete, unsecured access to a VM, making every port on the VM available to the public Internet. While this provides the most access to a VM, it is also the least secure access method. Because we want you to be able to tightly control public IP addresses, we do not place these in your account by default. You must enable them with a sales representative. If you use public IP addresses, we recommend that you tightly monitor the public IP addresses and secure the VMs to which they are attached. Here are some suggested security enhancements:

Best practices for securing VMs and environments

Environments are isolated on their own networks within Skytap Cloud. Administrators and users can further secure VMs and environments with the following best practices:

  • Enable the built-in setting to disable outbound Internet traffic from your environment. For more information, see Blocking outbound access to the public Internet from VMs in an environment.
  • Secure your VMs guest operating systems as if you were using physical computers on your corporate network. For more information, use the best practices recommended in Securing VMs exposed to the public internet.
  • If you are using a VPN to connect to your corporate network, use a single VPN remote subnet set to This will route all outbound traffic from the VM through your VPN, and prevent your VMs from accessing unsecure Internet sites.
  • Use Skytap Cloud networking features to isolate network traffic and secure VMs. Skytap Cloud supports complicated network configurations for multi-tiered applications or when additional network security is desired. For example, you can:

    • Use multiple networks within the same environment to create network VLANs or zones. Skytap Cloud does not support native network bridging, so each network zone will require distinct IP address space.

      If you are using multiple networks to create segregated zones within an environment, make sure the Allow all traffic between networks in this environment checkbox is cleared on the environment’s Network Settings page. If this option is checked, the Skytap Cloud gateway will act as a router between each of your networks within the environment and pass traffic directly between connected virtual machines.

    • Place a virtual machine on multiple networks, and then use that VM to pass traffic from one network. This option requires a VM with multiple networks adapters attached to the desired networks. Then this VM can be, or act as, a firewall or router appliance between its networks.

    • Place virtual machines on multiple networks, and then interact with these VMs differently depending on which network and network adapter you are connecting to. For example, you could connect a utility VM with management NICs to multiple networks within an environment or across environments.

REST API – Automated Security Scripts

The Skytap Cloud REST API supports the development of custom scripts you can use to automate security checks or apply security settings across your account. We have several sample security scripts on our GitHub account at; these scripts show administrators how to disable outbound Internet access on all environments or automatically delete all published services and sharing portals.