How To Fix DNO188 - RFC error: &1 &2

SAP Error Message - Details

• Message type: E = Error

• Message class: DNO - Messages for General Notifications

• Message number: 188

• Message text: RFC error: &1 &2

What causes this issue?

An error occurred when an RFC module was called in the SAP problem
notification system.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Use transaction SM59 to check the connections SAP-OSS and
SAP-OSS-LIST-O01.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DNO188 - RFC error: &1 &2 ?

  The SAP error message DNO188, which indicates an RFC (Remote Function Call) error, typically arises when there is an issue with communication between SAP systems or between an SAP system and an external system. The message format DNO188 RFC error: &1 &2 usually includes two parameters that provide more specific information about the error.
  Causes of DNO188 RFC Error
  
  
  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 Issues: Incorrect configuration of RFC destinations in the SAP system can cause communication failures. This includes incorrect settings in the transaction SM59.
  
  
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to perform the requested operation.
  
  
  System Availability: The target system may be down or not reachable, leading to an inability to establish an RFC connection.
  
  
  Resource Limitations: The SAP system may be experiencing resource limitations, such as memory or CPU constraints, which can affect its ability to process RFC calls.
  
  
  Version Compatibility: Incompatibility between different versions of SAP systems can also lead to RFC errors.
  
  
  Solutions to DNO188 RFC Error
  
  
  Check Network Connectivity: Ensure that there is proper network connectivity between the systems involved. You can use tools like ping or traceroute to diagnose network issues.
  
  
  Verify RFC Destination Configuration:
  
  Go to transaction SM59 and check the configuration of the RFC destination.
  Ensure that the connection type is correct (e.g., TCP/IP).
  Test the connection using the "Connection Test" option in SM59.
  
  
  
  Review User Authorizations: Check the user credentials being used for the RFC connection. Ensure that the user has the necessary authorizations to execute the required functions.
  
  
  Check System Status: Verify that the target system is up and running. You can check the system status in transaction SM51 or by logging into the target system directly.
  
  
  Monitor System Resources: Use transaction SM50 or SM66 to monitor the system's performance and check for any resource bottlenecks.
  
  
  Check for Version Compatibility: Ensure that the systems involved are compatible in terms of their SAP versions and any relevant patches.
  
  
  Review Logs: Check the system logs (transaction SM21) and the developer trace files (transaction ST22) for any additional error messages that may provide more context about the issue.
  
  
  Related Information
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to RFC errors.
  Documentation: Review the official SAP documentation for RFC and connectivity issues for more detailed troubleshooting steps.
  Community Forums: Consider checking SAP Community forums or other online resources for similar issues and solutions shared by other users.
  
  If the problem persists after trying the above solutions, it may be necessary to engage SAP support for further assistance.