How To Fix D3046 - RFC: Communication buffer too small

SAP Error Message - Details

• Message type: E = Error

• Message class: D3 - CCMS - DB2 on OS390

• Message number: 046

• Message text: RFC: Communication buffer too small

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 D3046 - RFC: Communication buffer too small ?

  The SAP error message D3046, which states "RFC: Communication buffer too small," typically occurs when the size of the communication buffer used for Remote Function Calls (RFC) is insufficient to handle the data being transmitted between the SAP systems or between an SAP system and an external application.
  Cause:
  
  Data Size Exceeds Buffer Limit: The data being sent or received exceeds the maximum size that the RFC communication buffer can handle.
  Configuration Issues: The RFC destination settings may not be configured correctly, leading to buffer size limitations.
  Network Issues: Network latency or interruptions can also contribute to communication problems, although this is less common for this specific error.
  
  Solution:
  
  
  Increase Buffer Size:
  
  You can increase the size of the RFC communication buffer. This is typically done in the SAP system configuration.
  Use transaction code RZ10 to adjust the profile parameters. Look for parameters like rfc/buffer_size and increase its value.
  After making changes, you will need to restart the SAP instance for the changes to take effect.
  
  
  
  Optimize Data Transmission:
  
  If possible, reduce the amount of data being sent in a single RFC call. This can be done by breaking down large data sets into smaller chunks.
  Review the function modules being called and see if they can be optimized to send less data.
  
  
  
  Check RFC Destination Settings:
  
  Use transaction code SM59 to check the settings of the RFC destination. Ensure that the settings are correct and that the target system is reachable.
  
  
  
  Monitor Network Performance:
  
  Ensure that there are no network issues affecting the communication between the systems. Check for latency, packet loss, or other network-related problems.
  
  
  
  Review SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional guidance.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for more details on RFC communication and buffer settings.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have implemented.
  Transaction Codes:
  
  RZ10: Profile parameter maintenance.
  SM59: RFC destination configuration.
  ST22: Dump analysis, in case the error is related to a program dump.
  SM21: System log, to check for any related errors or warnings.
  
  
  
  By following these steps, you should be able to resolve the D3046 error and ensure smooth communication between your SAP systems.