How To Fix /IWXBE/CORE151 - MQTT connection not established in reconnect attempt '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWXBE/CORE -

• Message number: 151

• Message text: MQTT connection not established in reconnect attempt '&1'

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWXBE/CORE151 - MQTT connection not established in reconnect attempt '&1' ?

  The SAP error message /IWXBE/CORE151 MQTT connection not established in reconnect attempt '&1' typically indicates that there is an issue with establishing a connection to the MQTT (Message Queuing Telemetry Transport) broker. This error can occur in various scenarios, such as during system startup, when trying to send messages, or when attempting to reconnect after a connection loss.
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the MQTT broker.
  Broker Unavailability: The MQTT broker may be down or not reachable due to maintenance or configuration issues.
  Incorrect Configuration: The connection parameters (like hostname, port, username, password) for the MQTT broker may be incorrectly configured in the SAP system.
  Firewall Restrictions: Firewalls or security groups may be blocking the connection to the MQTT broker.
  Protocol Mismatch: The version of the MQTT protocol being used may not be compatible with the broker.
  Resource Limitations: The SAP system or the MQTT broker may be running out of resources (like memory or connections).
  
  Solutions:
  
  Check Network Connectivity: Ensure that the SAP system can reach the MQTT broker. You can use tools like ping or telnet to test connectivity to the broker's IP address and port.
  Verify Broker Status: Check if the MQTT broker is running and accessible. You may need to restart the broker if it is down.
  Review Configuration: Double-check the MQTT connection settings in the SAP system. Ensure that the hostname, port, username, and password are correct.
  Firewall Settings: Review firewall rules to ensure that they allow traffic on the port used by the MQTT broker.
  Check Logs: Look at the logs of both the SAP system and the MQTT broker for any additional error messages that could provide more context on the issue.
  Resource Monitoring: Monitor the resource usage on both the SAP system and the MQTT broker to ensure they are not hitting any limits.
  Update Protocol: If there is a protocol mismatch, ensure that both the SAP system and the MQTT broker are using compatible versions of the MQTT protocol.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to MQTT connections.
  Documentation: Refer to the official SAP documentation for configuring MQTT connections and troubleshooting connectivity issues.
  Community Forums: Engage with SAP community forums or support channels for additional insights and assistance from other users who may have faced similar issues.
  
  If the problem persists after trying the above solutions, consider reaching out to SAP support for further assistance.