How To Fix PU753 - Error in communication target of system &1

SAP Error Message - Details

• Message type: E = Error

• Message class: PU - Upgrade and Transport Log Messages

• Message number: 753

• Message text: Error in communication target of system &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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Smart SAP Assistant

• What is the cause and solution for SAP error message PU753 - Error in communication target of system &1 ?

  The SAP error message PU753, which states "Error in communication target of system &1," typically indicates a problem with the communication setup between the SAP system and a target system (like an external system or another SAP instance). This error can occur in various contexts, such as when trying to send data, execute remote function calls, or perform other inter-system communications.
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the target system.
  Configuration Errors: The communication settings (RFC destinations, logical systems, etc.) may not be correctly configured.
  Authorization Issues: The user or system may not have the necessary authorizations to communicate with the target system.
  Target System Down: The target system may be down or not reachable.
  Incorrect Parameters: The parameters used for the communication (like user credentials, ports, etc.) may be incorrect.
  Firewall Restrictions: Firewalls or security settings may be blocking the communication.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection between the SAP system and the target system is active and stable. You can use tools like ping or traceroute to diagnose connectivity issues.
  Verify RFC Destination: Go to transaction SM59 in the SAP GUI and check the configuration of the RFC destination. Ensure that the connection type, target host, and system number are correctly set.
  Test Connection: In transaction SM59, you can test the connection to see if it is working properly. This will help identify if the issue is with the configuration or the network.
  Check Authorizations: Ensure that the user credentials used for the communication have the necessary authorizations in both the source and target systems.
  Review System Logs: Check the system logs (transaction SM21) for any additional error messages that might provide more context about the issue.
  Check Target System Status: Ensure that the target system is up and running. If it is down, you will need to wait until it is back online.
  Firewall and Security Settings: If applicable, check firewall settings to ensure that they are not blocking the required ports for communication.
  
  Related Information:
  
  Transaction Codes: 
  
  SM59: RFC Destinations
  SM21: System Log
  ST22: Dump Analysis
  SLG1: Application Log
  
  
  Documentation: Refer to SAP Help documentation for detailed information on configuring RFC connections and troubleshooting communication issues.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to the PU753 error.
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.