How To Fix XMS_ADM644 - RFC connection via destination '&1' failed with error '&2': "&3&4".

SAP Error Message - Details

• Message type: E = Error

• Message class: XMS_ADM - XMS - Administration

• Message number: 644

• Message text: RFC connection via destination '&1' failed with error '&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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message XMS_ADM644 - RFC connection via destination '&1' failed with error '&2': "&3&4". ?

  The SAP error message XMS_ADM644 indicates that there is an issue with an RFC (Remote Function Call) connection. This error typically arises when the system is unable to establish a connection to a specified destination. The message format includes placeholders for the destination name (&1), the error code (&2), and additional error details (&3&4).
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP systems.
  Incorrect Configuration: The RFC destination may not be configured correctly in the SAP system (e.g., incorrect hostname, port, or system ID).
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  Service Unavailability: The target system may be down or not reachable due to maintenance or other issues.
  Firewall Restrictions: Firewalls may be blocking the connection between the systems.
  SAP Gateway Issues: The SAP Gateway service may not be running or may be misconfigured.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or telnet to verify that the target system is reachable from the source system.
  
  
  
  Verify RFC Destination Configuration:
  
  Go to transaction SM59 in the SAP GUI and check the configuration of the RFC destination. Ensure that the hostname, system number, and other parameters are correct.
  
  
  
  Test the RFC Connection:
  
  In transaction SM59, select the RFC destination and use the "Connection Test" option to see if the connection can be established successfully.
  
  
  
  Check User Authorizations:
  
  Ensure that the user credentials used for the RFC connection have the necessary authorizations to access the target system.
  
  
  
  Check Target System Status:
  
  Verify that the target SAP system is up and running. Check for any maintenance activities or downtimes.
  
  
  
  Review Firewall Settings:
  
  Ensure that any firewalls between the systems allow traffic on the required ports for RFC communication (typically port 3200 for SAP).
  
  
  
  Check SAP Gateway:
  
  Ensure that the SAP Gateway service is running on the target system. You can check this in transaction SMGW.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: Manage RFC Destinations
  SMGW: SAP Gateway Monitor
  ST22: Dump Analysis (to check for any ABAP runtime errors)
  SICF: Check HTTP services if applicable
  
  
  
  Logs:
  
  Check the system logs (SM21) for any related error messages that might provide more context about the issue.
  
  
  
  SAP Notes:
  
  Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to RFC connections.
  
  
  
  By following these steps, you should be able to diagnose and resolve the XMS_ADM644 error effectively.