3788435 - rfc_logon_failure "name or password is incorrect" during delta extraction after s/4hana upgrade – SAP Datasphere

• An error occurs when logging into the source system via the SAP Datasphere connection after an s/4hana upgrade.
• Error message: "Name or password is incorrect (repeat logon)\nCode: RFC_LOGON_FAILURE".
• The issue occurs during transfer of delta data in replication flows.
• The error disappears after multiple retries (for example, the 4th attempt succeeds).

• Product: SAP Datasphere
• Connections: SAP S/4HANA On-Premise connection (ABAP-based source), Replication Flow/Data Flow with CDC

1. Upgrade the source system to SAP S/4HANA.
2. Resume delta replication flows in SAP Datasphere after the upgrade.
3. Observe the connection failure with: "Name or password is incorrect (repeat logon)\nCode: RFC_LOGON_FAILURE".
4. Retry the extraction multiple times; a subsequent attempt eventually succeeds.

A transient application server startup synchronization issue in the source s/4hana system after the upgrade, where application/message servers, ICM, gateways, or security services are not yet fully synchronized at the time the first post-upgrade access occurs.

SAP has not publicly announced specific roadmap items targeting automatic retry logic or upgrade-aware login handling in Datasphere at this time. 

For feature request, we have influence channel where you can raise feature request to our developer.Please take a look at below KBA to detail information.
0003332382 - How to create an enhancement request for SAP Datasphere?

Please contact with your Customer Success Partner (CSP) or Account Executive (AE) / Account Owner (AO) to get timely updates on this enhancement request. Furthermore, stay tuned about upcoming features in SAP Datasphere Roadmap.

Regarding the Replication Flows during source system upgrade, please consider the following recommendation:

- Before initiating the S/4HANA upgrade, pause all active Replication Flows from the Datasphere Data Integration Monitor.
- Rather than restarting immediately after the upgrade completes, allow sufficient time for all S/4HANA services (application servers, message servers, ICM, gateways, security services) to fully initialize and synchronize before resuming Datasphere replication. 
- Be aware that the first replication run after a pause may take considerably longer than usual, as it will replicate all source data changes that accumulated during the pause window.

Please also refer to 0003624337 - Handling Replication Flow during SAP S/4HANA system upgrade

• Refer to: 3624337 - Handling Replication Flow during SAP S/4HANA system upgrade
• Refer to: 3401601 - Handling (Real-time Remote table or Replication flow) after upgrading a source system of SAP Datasphere
• Refer to: 3483470 - Guideline for Troubleshooting Data and Replication Flows with ABAP Source Systems - SAP Datasphere
• Refer to: 3709719 - ABAP connector ABAP connection check FAILED with RFC_LOGON_FAILURE
• Refer to: 3435044 - Error "Name or password is incorrect RFC_LOGON_FAILURE" in S/4HANA On-Premise Connection

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