How To Fix PO455 - Connection closed after (protocol) error (RC=&1)

PO455 - Overview

• Message type: E = Error

• Message class: PO - Spooler message

• Message number: 455

• Message text: Connection closed after (protocol) error (RC=&1)

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.

What else can you do?

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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message PO455 - Connection closed after (protocol) error (RC=&1) ?

  The SAP error message "PO455 Connection closed after (protocol) error (RC=&1)" typically indicates that there was a communication issue between the SAP system and an external system or service. This error can occur in various scenarios, such as when using RFC (Remote Function Call), HTTP connections, or other network protocols.
  Causes:
  
  Network Issues: Temporary network disruptions or misconfigurations can lead to connection problems.
  Timeouts: If a request takes too long to process, it may exceed the timeout settings, resulting in a closed connection.
  Protocol Mismatch: The client and server may not be using compatible protocols or versions.
  Resource Limitations: The server may be overloaded or running out of resources, causing it to drop connections.
  Firewall or Security Settings: Firewalls or security settings may block or interrupt the connection.
  Configuration Errors: Incorrect settings in the SAP system or the external system can lead to communication failures.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there are no network issues between the SAP