How To Fix E0251 - Maintain port definition '&1' for the SAP System

E0251 - Overview

• Message type: E = Error

• Message class: E0 - SAP EDI messages

• Message number: 251

• Message text: Maintain port definition '&1' for the SAP System

What causes this issue?

The system could not find a port description for the <GL:port>port</>
that you specified for testing. The default values for the test tools
are derived from the port description.

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?

Check the settings in the menu "Goto -> Default values".
Create a new port description for the port &V1& for testing, as
necessary.
<DS:TRAN.WE21>Execute function</>

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E0251 - Maintain port definition '&1' for the SAP System ?

  The SAP error message E0251, which states "Maintain port definition '&1' for the SAP System," typically occurs when there is a missing or incorrectly configured port definition for an SAP system in the SAP Gateway or when trying to establish a connection between systems (like RFC connections).
  
  Cause:
  
  Missing Port Definition: The specified port definition for the SAP system is not maintained in the system.
  Incorrect Configuration: The port definition may exist but is incorrectly configured, leading to connection issues.
  Transport Layer Issues: If the system is part of a transport layer, the port definition may not have been transported correctly.
  Network Issues: Sometimes, network configurations or firewall settings can also lead to this error if they prevent proper communication.
  
  
  Solution:
  To resolve the E0251 error, follow these steps:
  
  
  Maintain Port Definition:
  
  Go to transaction code SM59 (RFC Destinations).
  Check if the RFC destination that corresponds to the port definition exists.
  If it does not exist, create a new RFC destination