How To Fix UPS202 - Only inbound packets can be processed

SAP Error Message - Details

• Message type: E = Error

• Message class: UPS - ALE Distribution Packet

• Message number: 202

• Message text: Only inbound packets can be processed

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message UPS202 - Only inbound packets can be processed ?

  The SAP error message UPS202 ("Only inbound packets can be processed") typically occurs in the context of the SAP system's communication with the SAP Business Connector or when dealing with the SAP Process Integration (PI) or SAP Process Orchestration (PO) environments. This error indicates that the system is expecting inbound communication packets but is receiving something else, which could be due to various reasons.
  Causes:
  
  Incorrect Configuration: The communication channel may not be configured correctly, leading to the system expecting inbound packets but receiving outbound packets instead.
  Network Issues: There may be network issues causing packets to be misrouted or not delivered correctly.
  Protocol Mismatch: The protocol used for communication may not match the expected protocol, leading to the system rejecting the packets.
  Firewall or Security Settings: Firewalls or security settings may be blocking the inbound packets or altering them in a way that they are no longer recognized as valid.
  Version Compatibility: There may be compatibility issues between different versions of SAP components or between SAP and third-party systems.
  
  Solutions:
  
  Check Configuration: Review the configuration settings for the communication channels in the SAP system. Ensure that the inbound and outbound settings are correctly defined.
  Network Troubleshooting: Use network monitoring tools to check for any issues in the network that may be affecting packet delivery. Ensure that the necessary ports are open and that there are no routing issues.
  Protocol Verification: Verify that the correct communication protocol is being used. Ensure that both the sender and receiver are configured to use the same protocol.
  Firewall Settings: Check firewall settings to ensure that they are not blocking or altering the packets. Adjust the settings as necessary to allow for proper communication.
  Update Components: Ensure that all SAP components are up to date and compatible with each other. If there are known issues with specific versions, consider applying patches or updates.
  Logs and Traces: Review the logs and traces in the SAP system for more detailed error messages that can provide additional context for the issue.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to the UPS202 error for any specific fixes or recommendations provided by SAP.
  Documentation: Refer to the official SAP documentation for the specific components you are using (e.g., SAP PI/PO, SAP Business Connector) for detailed configuration and troubleshooting steps.
  Community Forums: Engage with SAP community forums or support channels where other users may have encountered similar issues and can provide insights or solutions.
  
  If the issue persists after trying the above solutions, it may be beneficial to contact SAP support for further assistance.