How To Fix WT231 - Communication failure while starting remote function call &1

SAP Error Message - Details

• Message type: E = Error

• Message class: WT - Retail: Replenishment

• Message number: 231

• Message text: Communication failure while starting remote function call &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 WT231 - Communication failure while starting remote function call &1 ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WT231 Communication failure while starting remote function call &1
  
  Cause:
  This error occurs when there is a communication problem during the initiation of a Remote Function Call (RFC) from one SAP system to another. The system tries to start an RFC connection, but the communication fails due to one or more of the following reasons:
  
  Network issues: The network connection between the calling system and the target system is down or unstable.
  Incorrect RFC destination configuration: The RFC destination (SM59) is incorrectly configured (wrong target host, system number, or protocol).
  Target system is down or not reachable: The target SAP system is not running or is not reachable from the source system.
  Authorization problems: The user used for the RFC connection does not have the required authorizations.
  Firewall or security settings: Firewalls or security settings block the communication port used for the RFC.
  SAP Gateway issues: The SAP Gateway on the target system is not running or misconfigured.
  Incorrect program parameters: The function module or program trying to initiate the RFC is passing incorrect parameters.
  
  
  Solution:
  To resolve the WT231 error, follow these steps:
  
  
  Check RFC Destination (SM59):  
  
  Go to transaction SM59 in the calling system.  
  Test the RFC destination that is used for the remote call by clicking on Connection Test and Remote Logon.  
  If the test fails, verify the target host, system number, and logon credentials.
  
  
  
  Verify Network Connectivity:  
  
  Ping the target system from the source system server to ensure network connectivity.  
  Check for any network outages or firewall blocks between the two systems.
  
  
  
  Check Target System Status:  
  
  Ensure the target SAP system is up and running.  
  Check if the SAP Gateway is active on the target system (transaction SMGW).
  
  
  
  Check User Authorizations:  
  
  Verify that the user used in the RFC destination has the necessary authorizations to execute the remote function call.
  
  
  
  Review Firewall and Security Settings:  
  
  Ensure that the ports used for SAP communication (usually 32) are open and not blocked by firewalls.
  
  
  
  Check SAP Gateway Configuration:  
  
  On the target system, verify the gateway settings in RZ10 or RZ11 parameters (e.g., gw/acl_mode, gw/acl_info).  
  Restart the SAP Gateway if necessary.
  
  
  
  Review Logs and Traces:  
  
  Check system logs (SM21), developer traces (ST11), and gateway logs (SMGW) for more detailed error messages.
  
  
  
  Check Program Parameters:  
  
  If the RFC is called from a custom program, verify that the parameters passed are correct and consistent.
  
  
  
  
  Related Information:
  
  Transaction SM59: Used to configure and test RFC destinations.
  Transaction SMGW: SAP Gateway monitor, useful to check gateway status and logs.
  Transaction SM21: System log for error messages.
  Transaction ST11: Access developer traces for detailed error analysis.
  SAP Notes: Search for SAP Notes related to WT231 for any known issues or patches.
  RFC Types: Understand the type of RFC (synchronous, asynchronous, transactional) being used.
  
  
  Summary:
  The WT231 error indicates a communication failure when starting an RFC. The root cause is usually network issues, incorrect RFC configuration, or target system problems. By verifying the RFC destination, network connectivity, system status, and authorizations, you can identify and fix the issue.
  
  If you need help with specific system parameters or logs, please provide more details about your SAP landscape and the context in which the error occurs.