How To Fix IST0309 - Asynchronous data read failed. Reading synchronously

SAP Error Message - Details

• Message type: E = Error

• Message class: IST0 - General Messages IS Telecommunications

• Message number: 309

• Message text: Asynchronous data read failed. Reading synchronously

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 IST0309 - Asynchronous data read failed. Reading synchronously ?

  The SAP error message IST0309, which states "Asynchronous data read failed. Reading synchronously," typically occurs in the context of SAP's Internet Transaction Server (ITS) or when dealing with Web Dynpro applications. This error indicates that the system attempted to read data asynchronously but encountered an issue, leading it to revert to synchronous reading.
  Causes:
  
  Network Issues: Problems with network connectivity can lead to timeouts or failures in asynchronous data retrieval.
  Configuration Errors: Incorrect settings in the ITS or Web Dynpro configuration can prevent proper asynchronous communication.
  Resource Limitations: Insufficient system resources (like memory or processing power) can hinder the ability to handle asynchronous requests.
  Application Logic Errors: Bugs or issues in the application code that prevent proper handling of asynchronous calls.
  Browser Compatibility: Some browsers may not fully support the asynchronous features used by the SAP application.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there are no network issues affecting the connection between the client and the SAP server.
  Review Configuration Settings: Verify the configuration settings for ITS or Web Dynpro applications. Ensure that all parameters related to asynchronous processing are correctly set.
  Monitor System Resources: Check the server's performance metrics to ensure that it has adequate resources to handle requests. If necessary, optimize the server or increase its capacity.
  Debug Application Code: If you suspect that the issue is related to application logic, review the code for any potential bugs or misconfigurations that could affect asynchronous data handling.
  Test with Different Browsers: If the issue persists, try accessing the application using different web browsers to rule out browser-specific issues.
  Update SAP Components: Ensure that you are using the latest version of SAP components, as updates may contain bug fixes and improvements related to asynchronous processing.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the IST0309 error. SAP frequently updates its knowledge base with solutions for common problems.
  Logs and Traces: Review application logs and traces for more detailed error messages that can provide insight into the root cause of the issue.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found effective.
  
  If the problem persists after trying the above solutions, it may be beneficial to contact SAP support for further assistance.