How To Fix GW454 - Communication system error; function getlu failed; check LU

SAP Error Message - Details

• Message type: E = Error

• Message class: GW - Message Texts for Gateway

• Message number: 454

• Message text: Communication system error; function getlu failed; check LU

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message GW454 - Communication system error; function getlu failed; check LU ?

  The SAP error message GW454 indicates a communication system error related to the function getlu, which typically involves issues with the Logical Unit (LU) in the context of SAP's Gateway communication. This error can occur in various scenarios, often related to issues with the SAP Gateway or the underlying network configuration.
  Causes:
  
  Network Issues: Problems with the network connection between the SAP system and the external system or client can lead to this error.
  Configuration Errors: Incorrect configuration of the SAP Gateway or the Logical Unit (LU) can cause communication failures.
  Resource Availability: The LU may not be available or may be incorrectly defined in the system.
  Authorization Issues: Lack of proper authorizations for the user or system trying to access the LU.
  System Load: High load on the SAP system or the external system can lead to timeouts or failures in communication.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection between the SAP system and the external system is stable and functioning correctly. Use tools like ping or traceroute to diagnose network issues.
  Review Configuration: Verify the configuration of the SAP Gateway and the Logical Unit. Check the settings in transaction SM59 (RFC Destinations) to ensure that the destination is correctly defined and reachable.
  Check LU Availability: Ensure that the Logical Unit is available and properly configured. You may need to check the status of the LU in the relevant system.
  Review Authorizations: Ensure that the user or system has the necessary authorizations to access the LU. Check user roles and profiles in transaction SU01.
  Monitor System Load: Check the performance and load on both the SAP system and the external system. If the systems are under heavy load, consider optimizing performance or scheduling tasks during off-peak hours.
  Check SAP Notes: Look for any relevant SAP Notes that may address this specific error. SAP frequently updates its knowledge base with solutions for known issues.
  
  Related Information:
  
  
  Transaction Codes: 
  
  SM59: To check and configure RFC destinations.
  SMGW: To monitor the SAP Gateway.
  ST22: To check for dumps that may provide more context on the error.
  SICF: To check the configuration of HTTP services if applicable.
  
  
  
  Logs and Traces: Review the system logs (transaction SM21) and the Gateway logs (transaction SMGW) for additional error messages or warnings that may provide more context.
  
  
  SAP Support: If the issue persists after checking the above points, consider reaching out to SAP Support for further assistance, providing them with detailed information about the error and the steps you have already taken.
  
  
  By following these steps, you should be able to diagnose and resolve the GW454 error in your SAP system.