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Last Reviewed: July 21, 2022

Pantheon Secure Integration

Configuring your Drupal or WordPress site to use Secure Integration as a defense-in-depth solution to access systems behind firewalls.

This section provides information on Pantheon Secure Integration.

Pantheon Secure Integration, formerly known as Pantheon Enterprise Gateway (PEG), creates a secure tunnel between your firewall and your public facing website. This is an available add-on service for contract customers. Contact us for more information.

Pantheon's platform is elastic in nature. All sites have a dynamic outgoing IP and container IP addresses are not constant. This means that direct connections aren't sustainable. This can be a problem if your site needs to communicate with another service that restricts traffic by source IP. Secure Integration provides a solution.

How It Works

Secure Integration uses TLS encryption to create a tunnel from the application containers to a pair of F5 load balancers, offering a consistent IP address range (not a single address) from which requests are made to your local service.

Secure Integration diagram

Create a Secure Tunnel

Contact support and provide the following for each of your remote services:

  • IP address

    • Pantheon uses consistent IP addresses (not a URL) to identify a specific connection
  • Port number

  • Name to identify connection

    • Uppercase letters and underscores allowed

    • Used for PHP Constant that will replace the numeric port number in your code

After the setup is complete on our end, we'll provide you with the information you need to use Secure Integration, including a PHP constant in the format PANTHEON_SOIP_EXAMPLE, where EXAMPLE is replaced with the service name you specify.


At a minimum, allow one business day to fulfill this implementation request. Provide complete information to ensure timely and efficient processing, and to minimize any issues that may arise.

Configure Your Site

You must update your code after the gateway has been established. This process varies depending on the modules or plugins in use, and the type of service you're routing through the gateway.

PHP Constants as Port Numbers

After your Secure Integration is configured, we update your site environment with the PHP constant PANTHEON_SOIP_EXAMPLE. This constant translates to the port number, internal to your Pantheon Site, through which your external service can be accessed.

Example LDAP Connection with PHP Constants

Any code you're using to connect to the remote service must accept a PHP Constant for the port number.

For example: If you have two LDAP servers, one for staff and another for students, you may choose PANTHEON_SOIP_LDAP_STAFF and PANTHEON_SOIP_LDAP_STUDENTS as names to identify the connections.

In cases where you cannot supply a direct PHP constant, consider wrapping it into a variable. For example:

$externalconnection = "" . PANTHEON_SOIP_EXAMPLE;

See also: FAQ and Troubleshooting for LDAP


Set Reasonable Timeouts


It is important to set reasonable timeouts for requests sent via Secure Integration, since normal PHP timeouts are not considered on external requests. Outages can occur when timeouts are not appropriately set, due to failing gateway connection requests that build up and consume resources.

Set reasonable timeouts using PHP's cURL functions by setting CURLOPT_TIMEOUT and CURLOPT_CONNECTTIMEOUT. For a more complete example, see: Single-origin IP example code.

Patch LDAP Module (Drupal 7 Only)

WordPress and Drupal both work with Secure Integration. If you’re using the Drupal 7 LDAP module, apply the patch prepared by one of our engineers listed on The patch allows the use of a PHP constant for the port number, and gives a good example should you need to write a similar patch for another module.


Does Secure Integration work from all site environments?

Yes, it's configured on a site-by-site basis and works from all environments (Dev, Test, Live, and Multidev).

Does Secure Integration support connections to multiple external resources?

Secure Integration connects to the same external resource from all environments. If you need to connect to a separate resource, or test against a “test” version of the external resource, you will need an additional Integration configured to point to that resource. The additional Integration would be available to all environments.

Is Secure Integration a replacement for authentication?

No, Secure Integration is not a replacement for authentication, but rather is a defense-in-depth measure.

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