How To Fix TB427 - Error in RFC connection: & (&)

SAP Error Message - Details

• Message type: E = Error

• Message class: TB - SM31 table maintenance messages

• Message number: 427

• Message text: Error in RFC connection: & (&)

What causes this issue?

An error occurred when constructing a link to another system.

System Response

The comparison with the system specified cannot be carried out.

How to fix this error?

If the called system is not active, please arrange for it to be
activated.
If the called system has another version of the comparator, please
ensure compatible versions are available.
If the interface to the called system has incorrectly set parameters
please adjust this using transaction SM59.

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TB427 - Error in RFC connection: & (&) ?

  The SAP error message TB427 indicates that there is an issue with the Remote Function Call (RFC) connection. This error typically arises when there is a problem with the configuration or communication between the SAP systems involved in the RFC call. Here are some common causes, solutions, and related information for this error:
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP systems.
  Incorrect RFC Destination: The RFC destination may be incorrectly configured or may not exist.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  SAP System Down: The target SAP system may be down or not reachable.
  Firewall Restrictions: Firewalls may be blocking the communication between the systems.
  Incorrect Parameters: The parameters set in the RFC destination may be incorrect or incomplete.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or traceroute to verify that the systems can communicate over the network.
  
  
  
  Verify RFC Destination:
  
  Go to transaction SM59 in the SAP GUI.
  Check the configuration of the RFC destination (both the type and the connection parameters).
  Test the connection using the "Test Connection" button.
  
  
  
  Check User Authorizations:
  
  Ensure that the user ID used for the RFC connection has the necessary authorizations to access the target system.
  
  
  
  Check Target System Status:
  
  Ensure that the target SAP system is up and running. You can check this by logging into the target system directly.
  
  
  
  Review Firewall Settings:
  
  Ensure that the necessary ports for RFC communication are open in the firewall settings.
  
  
  
  Review RFC Parameters:
  
  Ensure that all required parameters in the RFC destination are correctly set, including the correct system ID, client, user, password, and language.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: To manage and configure RFC destinations.
  ST22: To check for dumps that may provide more context on the error.
  SM21: To view system logs for any related error messages.
  
  
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address specific issues related to RFC connections.
  
  
  Documentation: Review the SAP documentation for RFC connections to ensure that all configurations are correctly set up.
  
  
  If the issue persists after checking the above points, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.