How To Fix BT631 - Communication error at program start (&1&2&3&4)

SAP Error Message - Details

• Message type: E = Error

• Message class: BT - Background processing messages

• Message number: 631

• Message text: Communication error at program start (&1&2&3&4)

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message BT631 - Communication error at program start (&1&2&3&4) ?

  The SAP error message BT631, which indicates a "Communication error at program start," typically arises when there are issues related to the communication between the SAP system and the external program or service it is trying to connect to. This error can occur in various scenarios, such as when launching a transaction, executing a report, or interfacing with external applications.
  Causes of BT631 Error
  
  Network Issues: Problems with the network connection between the SAP system and the external program can lead to communication errors.
  Configuration Errors: Incorrect configuration settings in the SAP system or the external program can prevent successful communication.
  Authorization Issues: Lack of proper authorizations for the user or the system trying to initiate the communication can result in this error.
  Program Errors: Bugs or issues within the external program itself can cause it to fail to start correctly.
  Resource Limitations: Insufficient system resources (like memory or CPU) on the server hosting the external program can lead to failures.
  Firewall or Security Settings: Firewalls or security settings may block the communication between the SAP system and the external program.
  
  Solutions to BT631 Error
  
  Check Network Connectivity: Ensure that the network connection between the SAP system and the external program is stable and functioning correctly. You can use tools like ping or traceroute to diagnose network issues.
  Review Configuration Settings: Verify the configuration settings in both the SAP system and the external program. Ensure that all parameters are set correctly for communication.
  Check Authorizations: Ensure that the user or system has the necessary authorizations to execute the program or access the external service.
  Debug the External Program: If possible, check the logs or debug the external program to identify any internal errors that may be causing the communication failure.
  Monitor System Resources: Check the server hosting the external program for resource usage. If resources are low, consider optimizing or upgrading the server.
  Review Firewall/Security Settings: Ensure that any firewalls or security settings are configured to allow communication between the SAP system and the external program.
  
  Related Information
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the BT631 error. SAP frequently updates its knowledge base with solutions for common errors.
  Transaction Codes: Use transaction codes like SM21 (System Log) or ST22 (Dump Analysis) to check for any related logs or dumps that might provide more context about the error.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  
  If the problem persists after trying the above solutions, it may be beneficial to contact SAP support for further assistance.