Error
Error Code:
5521
SAP S/4HANA Error 5521: Lxplatform Communication Failure
Description
This error indicates that SAP S/4HANA failed to establish or maintain a connection with an external 'Lxplatform' service. It typically occurs during processes that require integration or data exchange with this specific external component, hindering critical business operations.
Error Message
ERR_TEXT_SA_LA_CALL: Lxplatform call failed.
Known Causes
4 known causesNetwork Connectivity Issues
Intermittent or complete loss of network connection between SAP S/4HANA and the Lxplatform service prevents successful communication.
Lxplatform Configuration Error
Incorrectly configured connection parameters, URLs, or authentication credentials within SAP S/4HANA prevent successful access to the Lxplatform.
External Service Unavailability
The external Lxplatform service itself is unavailable, offline, or experiencing technical issues, making it unreachable by SAP S/4HANA.
Firewall or Security Block
A network firewall, proxy, or security group is blocking the necessary outbound connection from SAP S/4HANA to the Lxplatform.
Solutions
4 solutions available1. Verify Lxplatform Service Status easy
Ensures the underlying Lxplatform service is running and accessible.
1
Access the SAP S/4HANA server via SSH or terminal.
2
Check the status of the Lxplatform service. The exact command might vary slightly depending on your operating system and S/4HANA installation, but it often involves `systemctl` or `service` commands.
sudo systemctl status lxplatform3
If the service is not running, start it.
sudo systemctl start lxplatform4
If the service is running but still experiencing issues, try restarting it.
sudo systemctl restart lxplatform5
After starting or restarting, re-check the status to confirm it's active and running.
sudo systemctl status lxplatform2. Review Lxplatform Configuration and Logs medium
Identifies misconfigurations or errors within the Lxplatform itself.
1
Locate the Lxplatform configuration files. These are typically found in directories like `/usr/sap/<SID>/<INSTANCE>/lxplatform/conf/` or similar, depending on your installation.
2
Examine the configuration files (e.g., `lxplatform.conf`, `server.properties`) for any obvious syntax errors, incorrect IP addresses, ports, or missing parameters. Pay close attention to any parameters related to communication or connectivity.
3
Access the Lxplatform log files. These are usually located in a `log` subdirectory within the Lxplatform installation path (e.g., `/usr/sap/<SID>/<INSTANCE>/lxplatform/log/`).
4
Search the log files for error messages that coincide with the time of the 5521 error. Look for keywords like 'error', 'fail', 'connection refused', 'timeout', or specific details about the communication failure.
tail -f lxplatform.log5
If configuration changes are made, restart the Lxplatform service using the commands from Solution 1.
sudo systemctl restart lxplatform3. Check Network Connectivity and Firewall Rules medium
Ensures that the SAP S/4HANA system can communicate with the Lxplatform component.
1
Identify the IP address and port that the Lxplatform component is configured to use for communication. This information can be found in the Lxplatform configuration files (see Solution 2).
2
From the SAP S/4HANA application server, attempt to ping the IP address of the Lxplatform component. If it's a separate server, use `ping <lxplatform_ip>`.
ping <lxplatform_ip>3
Use `telnet` or `nc` (netcat) to test connectivity to the specific port used by Lxplatform. For example:
telnet <lxplatform_ip> <lxplatform_port>
or
nc -vz <lxplatform_ip> <lxplatform_port>4
If connectivity tests fail, investigate firewall rules on both the SAP S/4HANA server and the Lxplatform server (if separate). Ensure that the necessary ports are open for communication.
5
If the Lxplatform is running on the same server as S/4HANA, verify that there are no local firewall rules (e.g., `iptables`, `firewalld`) blocking communication on the specified port.
sudo iptables -L | grep <lxplatform_port>
sudo firewall-cmd --list-all4. Restart SAP S/4HANA Application Server Instance medium
A broader restart that can resolve transient issues affecting communication layers.
1
Log in to the SAP S/4HANA application server using an administrator account.
2
Use the SAP Management Console (SMconsole) or the `startsap` / `stopsap` scripts to gracefully stop the SAP S/4HANA instance. It's crucial to stop all related processes.
stopsap3
Wait for all SAP processes to terminate completely. You can monitor this using `ps -ef | grep <SID>`.
4
Once all processes have stopped, start the SAP S/4HANA instance again.
startsap5
After the instance has fully started, attempt the operation that previously resulted in error 5521.