How To Fix BT503 - Unable to check the name of the target server

BT503 - Overview

• Message type: E = Error

• Message class: BT - Background processing messages

• Message number: 503

• Message text: Unable to check the name of the target server

What causes this issue?

When a background job is scheduled, you can specify a target computer.
This then determines, on which computer the job is executed. The name
used is checked for certain criteria.
This message indicates that this check was attempted, but could not be
completed. The reason for this is that the list of currently active SAP
systems could not be generated.

System Response

This message was then issued. Correct the target computer name. Please
note that you can also leave this field blank. The system load will
then determine, on which computer the job is executed.

How to fix this error?

Check whether the SAP system is logged on to the SAP message server, or
whether the message server is active. Use transaction sm51 and check
the list displayed whether the SAP system is in the list. If this list
cannot be generated, notify your system administrator, who will be able
to solve the problem.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message BT503 - Unable to check the name of the target server ?

  The SAP error message BT503, which states "Unable to check the name of the target server," typically occurs in the context of SAP Business Workflow or when dealing with background jobs and communication between different SAP systems or instances. This error can arise due to various reasons, including network issues, configuration problems, or incorrect settings in the SAP system.
  Causes:
  
  Network Issues: There may be connectivity problems between the SAP system and the target server. This could be due to firewall settings, DNS resolution issues, or network outages.
  Incorrect Configuration: The target server may not be correctly configured in the SAP system. This includes incorrect entries in the RFC destination or the logical system configuration.
  Missing Authorizations: The user or service account trying to access the target server may not have the necessary authorizations.
  SAP System Configuration: Issues with the SAP system's configuration, such as incorrect settings in the transaction codes like SM59 (RFC Destinations)