Microtechx

There is a hidden security trap in SAP multi-region failover... But we can help you avoid it

Most architects design multi-region SAP environments with geographic redundancy, load balancers, and data sync in mind. But there's one thing that routinely gets overlooked until it breaks in production: authentication.

In SAP BTP, authentication is handled by XSUAA - the Authorization and Trust Management Service - which is scoped to a specific subaccount. When you generate an OAuth token in your primary subaccount, that token only works there. The moment a failover triggers and DNS routing switches users to your secondary subaccount, those tokens are dead. Same issue with client credentials and certificates, if you're not careful.

For enterprise applications running SAP Integration Suite or Build Work Zone, this is a real operational risk...

The good news? There are clean solutions:
For SAP Integration Suite (iFlows):
- Use IAS Basic Authentication: link both subaccounts to the same IAS or custom IDP, and users authenticate seamlessly across regions
- Or use External Certificates: as long as the same certificate is registered in both primary and secondary subaccounts, failover becomes transparent to the consumer
For Build Work Zone Standard Edition:
- Keep credentials managed in IAS or a custom IDP linked to both subaccounts

Note: authentication cookies may still be tied to the primary region, meaning users could be prompted to re-enter credentials during a rare failover - easily solved with SSO

Identity design must be treated as a first-class concern in multi-region resiliency. A failover that routes traffic perfectly but breaks login is still a failed failover.

What authentication patterns have you used in your multi-region SAP setup? Drop your experience in the comments 👇