How To Fix SIG157 - Unable to access card reader

SAP Error Message - Details

• Message type: E = Error

• Message class: SIG - Digital Signature

• Message number: 157

• Message text: Unable to access card reader

What causes this issue?

The system cannot access the card reader for one of the following
reasons:
The card reader is switched off.
The profile for the card reader was not installed correctly in the
<GL:Secure_Store_and_Forward>SSF</> information about the user.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

RESET N1
Depending on what caused the error, proceed as follows:
Switch on the card reader.
Ask your system administrator to correct the SSF information about your
user (see Customizing for <LS>Basis Components</>, section <LS>System
Administration</> -> <LS>Administration of External Security
Systems</>).
After the SSF information has been changed, call the dialog box for the
digital signature again,
Execute your signature.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SIG157 - Unable to access card reader ?

  The SAP error message SIG157 "Unable to access card reader" typically indicates that the system is having trouble communicating with a card reader device. This can occur in various scenarios, such as when using smart cards for authentication or other purposes within the SAP environment.
  Causes:
  
  Hardware Issues: The card reader may be malfunctioning or not properly connected to the computer.
  Driver Problems: The necessary drivers for the card reader may not be installed, outdated, or corrupted.
  Configuration Issues: The SAP system may not be properly configured to recognize the card reader.
  Permissions: The user may not have the necessary permissions to access the card reader.
  Software Conflicts: Other software or security settings may be interfering with the card reader's operation.
  
  Solutions:
  
  Check Hardware Connections: Ensure that the card reader is properly connected to the computer. If it's a USB device, try plugging it into a different USB port.
  Test the Card Reader: Use the card reader with another application or system to verify that it is functioning correctly.
  Update Drivers: Check for and install any updates for the card reader drivers. You can usually find these on the manufacturer's website.
  SAP Configuration: Verify that the SAP system is configured correctly to use the card reader. This may involve checking settings in the SAP GUI or related configuration files.
  User Permissions: Ensure that the user has the necessary permissions to access the card reader. This may involve checking user roles and authorizations in SAP.
  Check for Conflicts: Look for any other software that may be interfering with the card reader's operation, such as security software or other device management tools.
  Restart the System: Sometimes, simply restarting the computer can resolve temporary issues with device recognition.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance or patches related to the SIG157 error. SAP frequently updates its knowledge base with solutions for known issues.
  Documentation: Refer to the documentation for the specific card reader being used, as it may provide additional troubleshooting steps or configuration settings.
  Support: If the issue persists, consider reaching out to SAP support or the card reader manufacturer for further assistance.
  
  By following these steps, you should be able to diagnose and resolve the SIG157 error in your SAP environment.