Hi  @Ruu 

The error -41018 typically indicates an authentication failure, which in this case is occurring when you try to unauthorize a client. This can happen due to various reasons, including network connectivity issues, controller configuration problems, or temporary glitches.

Troubleshooting Steps

1. Check Network Connectivity

• Ensure that your SDN Controller has a stable network connection. Intermittent connectivity issues can cause such errors.

• Verify that there are no firewall rules or network policies blocking the communication between the controller and the client.

2. Client Status

• Ensure that the client you are trying to unauthorize is correctly connected and recognized by the controller.

• Sometimes, clients might be in a state where they cannot be properly unauthenticated due to a previous error or timeout.

3. Firmware and Software Updates

• Ensure that your SDN Controller and all associated devices are running the latest firmware and software versions.

4. Controller Performance

• Although you mentioned that your CPU usage is not exceeding 20%, it’s still worth monitoring the overall performance of the controller.

• Ensure that there are no other processes or tasks running in the background that might be affecting the controller’s responsiveness.

5. Retry the Operation

• Sometimes, simply retrying the unauthorization operation after a short period can resolve the issue. Temporary glitches can cause such errors, and a retry might succeed.