How To Fix /UI2/INTEROP028 - HTTP server error: &1&2&3&4

SAP Error Message - Details

• Message type: E = Error

• Message class: /UI2/INTEROP -

• Message number: 028

• Message text: HTTP server error: &1&2&3&4

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?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

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 /UI2/INTEROP028 - HTTP server error: &1&2&3&4 ?

  The SAP error message /UI2/INTEROP028 HTTP server error: &1&2&3&4 typically indicates that there is an issue with the HTTP server communication when trying to access a specific service or resource in the SAP Fiori/UI2 environment. This error can arise from various underlying causes, and the parameters &1, &2, &3, and &4 usually provide additional context about the specific error encountered.
  Possible Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the HTTP server.
  Server Configuration: The HTTP server may not be configured correctly, or there may be issues with the server settings.
  Service Unavailability: The service you are trying to access may be down or not available.
  Authorization Issues: The user may not have the necessary permissions to access the requested resource.
  Resource Limitations: The server may be experiencing high load or resource limitations, leading to timeouts or errors.
  Incorrect URL: The URL being accessed may be incorrect or malformed.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there is proper network connectivity between the SAP system and the HTTP server. You can use tools like ping or traceroute to diagnose network issues.
  Review Server Logs: Check the HTTP server logs for any error messages or warnings that could provide more insight into the issue.
  Verify Service Availability: Ensure that the service you are trying to access is up and running. You can do this by accessing the service directly through a browser or using tools like Postman.
  Check User Authorizations: Verify that the user has the necessary authorizations to access the service. You may need to consult with your SAP security team.
  Monitor Server Load: If the server is under heavy load, consider optimizing performance or scaling resources to handle the demand.
  Validate URL: Double-check the URL being accessed to ensure it is correct and properly formatted.
  
  Related Information:
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Fiori Launchpad Configuration: If this error occurs in the context of the Fiori Launchpad, review the configuration settings for the launchpad and the associated services.
  System Logs: Use transaction codes like SM21 (System Log) and SLG1 (Application Log) to check for any related error messages in the SAP system.
  
  If the issue persists after trying the above solutions, it may be beneficial to engage SAP support for further assistance, providing them with the full error message and any relevant logs or context.