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Description

This 'Internal Error' indicates an unexpected problem occurred within an SAP S/4HANA API call. It means the system encountered an unhandled exception or a backend service failed to complete an operation, preventing the API request from succeeding.

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Error Message

ERR_API_INTERNAL_ERROR

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Known Causes

4 known causes

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Backend Service Unavailability

A critical backend service or component required by the API is currently unavailable or unresponsive.

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Incorrect API Configuration

The API or its dependent services might be improperly configured, leading to runtime failures.

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Temporary System Overload

The SAP S/4HANA system or the specific API service is under high load, causing resource exhaustion or timeouts.

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Network Connectivity Issues

Intermittent network problems are disrupting communication between the API caller and the SAP S/4HANA system.

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Solutions

4 solutions available

1. Analyze SAP Gateway and API Hub Logs medium

Investigate logs for specific error details related to the API call.

1

Access the SAP Gateway (transaction SMGW) and check for active connections and any error messages associated with the RFC destination used by the API.

2

Review the SAP Gateway Error Log (transaction SMGW -> Goto -> Trace -> Gateway Error Log) for detailed information about the failure.

3

If the API is external or integrates with SAP API Hub, check the API Hub monitoring and logs for any reported issues or status updates.

4

Examine the S/4HANA application logs (transaction SLG1) filtering by the relevant application component and object related to the API call for further context.

2. Verify RFC Destination Configuration easy

Ensure the RFC destination used for API communication is correctly configured and active.

1

Navigate to transaction SM59 in S/4HANA.

2

Locate the RFC destination used by the API. It might be an 'G' (HTTP Connection to RFC) or '3' (Registered Server Program) type destination.

3

Perform a 'Connection Test' and 'Remote Login Test' for the RFC destination.

4

If tests fail, review the target host, program ID (for registered servers), security settings, and credentials within the RFC destination configuration.

3. Check Underlying Database Connectivity and Performance medium

Rule out database-level issues impacting API processing.

1

Monitor the S/4HANA database (e.g., SAP HANA) for any performance bottlenecks, high CPU usage, or excessive I/O operations during the time of the API error.

2

Execute basic SQL queries to check connectivity and responsiveness of the database from the S/4HANA application servers. For SAP HANA, you can use SQL commands like `SELECT 1 FROM DUMMY;`.

SELECT 1 FROM DUMMY;

3

Review database alert logs for any errors or warnings that coincide with the API processing time.

4

If the API involves complex data retrieval or manipulation, analyze the execution plans of relevant SQL statements to identify potential performance issues.

4. Restart SAP Gateway and Related Services easy

A simple restart can resolve transient issues.

1

Identify the SAP Gateway instance number and hostname where the API is running.

2

Use the SAP Management Console (SMC) or command-line tools to restart the SAP Gateway service. For example, on Linux:

sudo systemctl restart <sap_instance_name>.<gateway_service_name>

3

If the API is part of a specific application server, consider restarting that application server as well.

4

Test the API call again after the services have restarted.

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Related Errors

5 related errors

SAP S/4HANA Error 591: API Internal Processing Issue