How To Fix TC011 - The switches in SCSA cannot be accessed

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 011

• Message text: The switches in SCSA cannot be accessed

What causes this issue?

The trace system uses switches that are created in the shared memory
segment 'SCSA'. The system cannot currently access these swtiches.

System Response

The trace system does not work. It remains switched off.

How to fix this error?

Look for the error in the syslog that resulted in the SCSA being
missing or unuseable.
When you have corrected the error, restart the instance (the SAP
application server).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TC011 - The switches in SCSA cannot be accessed ?

  The SAP error message TC011, which states "The switches in SCSA cannot be accessed," typically relates to issues with the SAP system's ability to access the switches in the SAP Central Services (SCS) instance. This can occur in a variety of scenarios, particularly in a distributed SAP environment where multiple application servers are involved.
  Causes:
  
  Network Issues: There may be network connectivity problems between the application server and the SCS instance.
  Configuration Errors: Incorrect configuration settings in the SAP system profile or in the SCS instance can lead to this error.
  SCS Instance Down: The SCS instance may not be running or may have crashed.
  Authorization Issues: The user or service account may not have the necessary permissions to access the SCS.
  Resource Limitations: Insufficient system resources (CPU, memory) can prevent the SCS from functioning properly.
  Firewall Settings: Firewalls may be blocking the necessary ports for communication between the application server and the SCS.
  
  Solutions:
  
  Check SCS Status: Ensure that the SCS instance is up and running. You can check this using transaction code SM51 to see the list of application servers and their statuses.
  Network Connectivity: Verify that there are no network issues. You can use tools like ping or traceroute to check connectivity between the application server and the SCS.
  Review Configuration: Check the instance profile parameters for the SCS and ensure they are correctly configured. Look for parameters related to the SCS and ensure they are set correctly.
  Check Authorizations: Ensure that the user or service account has the necessary authorizations to access the SCS.
  Monitor System Resources: Use tools like OS monitoring to check if the server has sufficient resources (CPU, memory, etc.) and address any bottlenecks.
  Firewall Rules: Review firewall settings to ensure that the necessary ports (typically 36xx for SCS) are open and not being blocked.
  Restart Services: If the SCS is down or unresponsive, consider restarting the SCS instance or the entire SAP system if necessary.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to TC011 for any specific patches or updates that may address this issue.
  Logs: Review the system logs (transaction SM21) and developer traces (transaction ST22) for any additional error messages that may provide more context.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  If the problem persists after trying the above solutions, it may be beneficial to contact SAP support for further assistance.