How To Fix PU673 - Internal communication error with destination &1

SAP Error Message - Details

• Message type: E = Error

• Message class: PU - Upgrade and Transport Log Messages

• Message number: 673

• Message text: Internal communication error with destination &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.

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

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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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message PU673 - Internal communication error with destination &1 ?

  The SAP error message PU673, which states "Internal communication error with destination &1," typically indicates that there is a problem with the communication between the SAP system and a specified destination. This can occur in various scenarios, such as when trying to connect to an external system, a remote function call (RFC), or when using certain SAP services.
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the destination.
  Configuration Errors: The destination might not be correctly configured in the SAP system (e.g., incorrect RFC destination settings).
  Authorization Issues: The user or system may not have the necessary authorizations to access the destination.
  Service Availability: The service or system you are trying to reach may be down or not available.
  Firewall Restrictions: Firewalls or security settings may be blocking the communication.
  SAP Kernel Issues: There may be bugs or issues in the SAP kernel or the specific version of the software being used.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection between the SAP system and the destination is stable and functioning. You can use tools like ping or traceroute to diagnose network issues.
  Verify RFC Destination: Go to transaction SM59 in SAP and check the configuration of the RFC destination. Ensure that the settings (such as the target host, system number, and client) are correct.
  Test Connection: In transaction SM59, you can test the connection to the RFC destination to see if it is working properly. This can help identify if the issue is with the destination itself.
  Check Authorizations: Ensure that the user or system has the necessary authorizations to access the destination. This may involve checking roles and profiles in transaction PFCG.
  Review Logs: Check the SAP system logs (transaction SM21) and the application logs (transaction SLG1) for any additional error messages or information that may provide more context about the issue.
  Firewall Settings: If applicable, check the firewall settings to ensure that the necessary ports are open for communication between the systems.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address known issues related to this error message. Sometimes, applying a patch or update can resolve the issue.
  Contact SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance.
  
  Related Information:
  
  Transaction Codes: 
  
  SM59 - RFC Destinations
  SM21 - System Log
  SLG1 - Application Log
  PFCG - Role Maintenance
  
  
  SAP Notes: Always check for the latest SAP Notes related to communication errors, as they may provide specific fixes or workarounds.
  Documentation: Review SAP documentation for details on configuring RFC destinations and troubleshooting communication issues.
  
  By following these steps, you should be able to diagnose and resolve the PU673 error in your SAP environment.