External Connectivity for Appian Cloud

Appian Cloud offers multiple ways to connect to resources in your self-managed network or private cloud.

External connectivity options

Appian Cloud offers the following connectivity options:

Option	Description
Appian Cloud VPN (Static or Dynamic)	IPSec VPN connections enable access to computer resources on a private network from an Appian Cloud environment. Each Appian Cloud environment can have multiple VPN tunnels enabled to securely integrate with resources in different networks.
AWS PrivateLink	Customers who have IT infrastructure running on AWS can use AWS PrivateLink to enable secure access from Appian Cloud to their private AWS networks. PrivateLink can be used to integrate with self-hosted services such as databases or authentication systems through an AWS Virtual Private Cloud (VPC).

Connectivity feature comparison

The table below lists the differences between the available connectivity options.

	Static VPN	Dynamic VPN	PrivateLink
Description	Policy-based static VPN tunnel	Route-based dynamic VPN connection	AWS PrivateLink connection between Appian's VPC and your VPC
Connection type	Bidirectional: Appian ↔ your network resources	Bidirectional: Appian ↔ your network resources	Unidirectional per configuration: Appian → your VPC Endpoint OR your VPC Endpoint Service → Appian
Number of connections needed	1 VPN tunnel; additional if failover enabled	Max: 2 connections per site	N/A
Private DNS	Supported	Supported	Custom DNS only; private DNS hostnames required
In-region failover	1 additional VPN tunnel; uses a ping test to trigger failover	Automatic; occurs within a predefined time frame	Failover to a new interface VPC endpoint requires integration object updates in Appian
Cross-region failover (EBC)	Supported	Supported	Supported; preconfigure inbound or outbound connections with Appian Support
Steps to get started	VPN Integration	Dynamic VPN Routing	AWS PrivateLink Integration

Browse these pages

The pages in this browser cover everything you need to set up and manage connectivity between Appian Cloud and your network:

• VPN: IPsec VPN tunnels for secure, bidirectional connectivity to resources in your private network, including static VPN, dynamic routing, and inbound access options.

• AWS PrivateLink: Private communication between Appian Cloud and AWS resources in your VPC, for both outbound and inbound access.

• Microsoft Azure: Connectivity options for integrating Appian Cloud with resources hosted in Microsoft Azure.

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