How To Fix OL812 - RFC communications error: & & & &

SAP Error Message - Details

• Message type: E = Error

• Message class: OL - Workflow object types: Run-time system

• Message number: 812

• Message text: RFC communications error: & & & &

What causes this issue?

Connection problems experienced when a function module was called in
another system.

How to fix this error?

Try again later.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OL812 - RFC communications error: & & & & ?

  The SAP error message OL812, which indicates an RFC (Remote Function Call) communications error, can arise from various issues related to network connectivity, configuration, or system settings. Here’s a breakdown of potential causes, solutions, and related information:
  Causes:
  
  Network Issues: Problems with the network connection between the SAP systems can lead to RFC errors. This could be due to firewalls, routing issues, or network outages.
  Configuration Errors: Incorrect settings in the RFC destination configuration (transaction SM59) can cause communication failures.
  System Availability: The target SAP system may be down or not reachable due to maintenance or other issues.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  SAP Kernel Issues: Incompatibilities or bugs in the SAP kernel version can also lead to RFC errors.
  Timeout Settings: If the timeout settings for the RFC connection are too low, it may lead to premature termination of the connection.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or traceroute to verify connectivity between the systems.
  Ensure that firewalls are configured to allow traffic on the required ports.
  
  
  
  Review RFC Destination Configuration:
  
  Go to transaction SM59 and check the configuration of the RFC destination.
  Ensure that the connection type, target host, and system number are correctly set.
  Test the connection from SM59 to see if it is successful.
  
  
  
  Check System Status:
  
  Verify that the target SAP system is up and running.
  Check for any scheduled maintenance or downtime.
  
  
  
  Review User Authorizations:
  
  Ensure that the user ID used for the RFC connection has the necessary authorizations to perform the required actions.
  
  
  
  Check SAP Kernel Version:
  
  Ensure that both systems are running compatible versions of the SAP kernel.
  Consider applying any relevant patches or updates.
  
  
  
  Adjust Timeout Settings:
  
  If necessary, increase the timeout settings in the RFC destination configuration.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: To manage RFC destinations.
  SM21: To check system logs for any related error messages.
  ST22: To check for dumps that may provide more context on the error.
  
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to RFC errors.
  
  
  Logs and Traces: Check the developer traces (transaction ST11) and RFC traces for more detailed error messages that can help diagnose the issue.
  
  
  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.