How To Fix /IWXBE/CORE121 - MQTT connection acknowledge received for channel '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWXBE/CORE -

• Message number: 121

• Message text: MQTT connection acknowledge received for channel '&1'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWXBE/CORE121 - MQTT connection acknowledge received for channel '&1' ?

  The SAP error message /IWXBE/CORE121 indicates that an MQTT (Message Queuing Telemetry Transport) connection acknowledgment has been received for a specific channel. This message typically arises in the context of SAP applications that utilize MQTT for communication, particularly in scenarios involving IoT (Internet of Things) or real-time data processing.
  Cause:
  
  Connection Issues: The error may occur if there are issues with the MQTT connection, such as network interruptions or misconfigurations in the MQTT broker or client settings.
  Channel Configuration: The channel specified in the error message (&1) may not be properly configured or may not exist in the system.
  Broker Response: The MQTT broker may be sending an acknowledgment for a connection that was not properly established or was previously disconnected.
  Version Mismatch: There could be a version mismatch between the SAP system and the MQTT broker, leading to compatibility issues.
  
  Solution:
  
  Check MQTT Configuration: Verify the configuration settings for the MQTT channel in the SAP system. Ensure that the channel name is correct and that all necessary parameters (like broker address, port, and credentials) are properly set.
  Network Connectivity: Ensure that there are no network issues preventing the SAP system from communicating with the MQTT broker. Check firewalls, proxies, and network routes.
  Broker Logs: Review the logs of the MQTT broker to identify any errors or warnings that may provide more context about the acknowledgment message.
  Reconnect: If the connection was lost, attempt to reconnect to the MQTT broker. This may involve restarting the SAP application or the MQTT client.
  Update Software: Ensure that both the SAP system and the MQTT broker are running compatible versions. If necessary, update to the latest versions to resolve any compatibility issues.
  Consult Documentation: Refer to the SAP documentation for specific guidance on configuring and troubleshooting MQTT connections.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide patches related to MQTT connectivity.
  MQTT Protocol: Familiarize yourself with the MQTT protocol and its connection acknowledgment process to better understand the context of the error.
  Community Forums: Engage with SAP community forums or support channels where similar issues may have been discussed, and solutions shared.
  
  If the problem persists after following these steps, consider reaching out to SAP support for further assistance, providing them with detailed logs and error messages for a more in-depth analysis.