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We will further protect our communication by password protecting the connections to prevent unauthorized access from beyond the network boundaries.We do have the need to allow indirect communication to our SAP backend systems that do not have public-facing IP addresses.The first two points above are especially relevant as they both apply in our scenario: Improve performance and stability by reducing the load on the SAP System within a local area network (LAN) when communicating with a wide area network (WAN).Improve network security by password-protecting your connection and your data from unauthorized access from beyond your network boundaries and by allowing access only from a specified SAProuter.Establish an indirect connection if the network configuration does not allow the communicating programs to reach each other directly due to a lack of official IP addresses or firewall system restrictions.The SAProuter is especially useful in the following scenarios: The first step in our configuration is to set up a SAProuter, which will act as a proxy between the SAP systems and external networks where the end users will be connecting from. Let’s get started then! Here follows the steps in more detail to get the combination working. No further unencrypted access is allowed. Parameters are set on the SAP backend systems to enforce SNC access.A server SNC certificate is exported and then imported to each client machine, after which secure access to the backend systems is possible. SNC is enabled on both the backend and SAP GUI clients.SAP GUI clients are configured to access the SAP backend systems via the AWS load balancer & SAProuter (at this stage the connectivity is not using SNC and is not encrypted).This will provide access to the SAProuter from the Internet, which in turn redirects traffic to the SAP backend systems An AWS network load balancer is configured with the SAProuter as its target.A SAProuter is installed on an instance hosted in a private subnet in AWS which redirects traffic to the backend SAP systems.Later in the blog, we will drill into each of these steps in more detail. Refer to the above diagram for the main steps described below. The following diagrams summarize the scenario and the configuration steps required for secure access for SAP GUI clients:įigure 1: Not configured, no access provided to SAPGui clients to SAP Backend systems hosted on AWSįigure 2: Steps required for a fully configured scenario
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AWS EC2 instance provisioning and configuration.AWS network load balancer configuration.Therefore, there will be an assumption that the reader has reasonable experience in the following topics: The blog needs to be concise whilst still providing adequate information for most SAP Basis consultants to follow without going into too much detail. As such, users will still require basic authentication (User ID and password) when logging in to the SAP back-end systems. The scenario also does not consider or allow for Single-Sign-On (SSO) access. However, the same general principles should still apply for other Cloud service providers. The blog assumes a scenario where SAP systems are hosted in AWS in a private subnet. This blog provides a method for this, it also goes further in that it provides a method to ensure that only the required users are able to connect, and that security is enforced by the back-end SAP system. How do you allow flexible and easy remote access whilst still ensuring security? Providing access to remote users without a VPN poses a security challenge. However, some customers do not want the administrative burden of VPNs. As a result, SAP customers have realised the need to facilitate access to corporate systems from outside the corporate network. As a result of the recent Covid-19 pandemic and changing work practices, many users need access to SAP systems from remote locations (such as homes, hotels, coffee shops and such).