How To Fix TC021 - Trace disabled in system: Unable to read switch

SAP Error Message - Details

• Message type: E = Error

• Message class: TC - System trace. (RSTR....)

• Message number: 021

• Message text: Trace disabled in system: Unable to read switch

What causes this issue?

You tried to read the individual trace switches from the current
system. However, the trace mechanism is completely switched off. The
individual switches are then invalid.

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?

The editor contents remain unchanged. You can retrieve them from the
database or buffer, or maintain them manually.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TC021 - Trace disabled in system: Unable to read switch ?

  The SAP error message "TC021 Trace disabled in system: Unable to read switch" typically indicates that the system is unable to read the trace settings due to the trace being disabled. This can occur for various reasons, including configuration issues or system settings.
  Cause:
  
  Trace Disabled: The trace functionality may be disabled in the system configuration.
  Authorization Issues: The user may not have the necessary authorizations to access or modify trace settings.
  System Configuration: There may be issues with the configuration of the tracing parameters in the system.
  Technical Issues: There could be underlying technical issues with the SAP system that prevent it from reading the trace settings.
  
  Solution:
  
  Enable Trace: Check the system settings to ensure that tracing is enabled. This can typically be done in transaction ST01 (System Trace) or ST05 (SQL Trace).
  Check Authorizations: Ensure that the user has the necessary authorizations to access and modify trace settings. You may need to consult with your SAP security team to verify this.
  Review Configuration: Go to transaction RZ10 to check the profile parameters related to tracing. Ensure that the parameters are set correctly.
  Restart the System: In some cases, a system restart may be required to apply changes or resolve temporary issues.
  Check SAP Notes: Look for relevant SAP Notes that may address this specific error. SAP frequently updates its knowledge base with solutions for known issues.
  Consult SAP Support: If the issue persists, consider reaching out to SAP Support for further assistance. They can provide more detailed troubleshooting steps based on your specific system configuration.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as ST01, ST05, RZ10, and RZ11 for tracing and configuration.
  SAP Notes: Search the SAP Support Portal for notes related to tracing issues and the specific error message.
  Documentation: Review SAP documentation on system tracing and performance analysis for more insights into how tracing works and how to configure it properly.
  
  By following these steps, you should be able to diagnose and resolve the "TC021 Trace disabled in system: Unable to read switch" error in your SAP environment.