How To Fix XS637 - Currently no delivery to &, as recipient cannot be reached

XS637 - Overview

• Message type: E = Error

• Message class: XS - SAPconnect: All messages

• Message number: 637

• Message text: Currently no delivery to &, as recipient cannot be reached

What causes this issue?

The message could not be delivered to recipient &V1&. A temporary error
(such as the hard drive being full) has occurred in the processing of
the communication system.

System Response

Processing was completed normally.
Additional information of the used node (if available, in the system
language of the node):
&V4&

How to fix this error?

Attempt to resend the message at a later time.

Procedure for System Administrators

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.

XS637 - Details

• The SAP error message XS637, which states "Currently no delivery to &, as recipient cannot be reached," typically occurs in the context of SAP's messaging or communication systems, such as SAP Exchange Infrastructure (XI) or SAP Process Integration (PI). This error indicates that the system is unable to deliver a message to the specified recipient due to connectivity issues or configuration problems.
  Causes:
  
  Network Issues: There may be network connectivity problems between the sender and the recipient systems.
  Recipient Configuration: The recipient's configuration may be incorrect or incomplete, preventing successful message delivery.
  Service Availability: The service or endpoint that the message is trying to reach may be down or unavailable.
  Routing Issues: There may be issues with the routing configuration in the integration scenario, leading to the inability to find the correct recipient.
  Firewall or Security Settings: Firewalls or security settings may be blocking the communication between systems.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there is proper network