It appears that you're encountering an issue when trying to delete a CSR (Certificate Signing Request) in ISE (Identity Services Engine). The error message you're receiving, "The following CSR(s) cannot be deleted. Internal error occurred while deleting," suggests that there might be a technical problem preventing the deletion process. Restarting ISE was a logical first step, but since that didn't resolve the issue, there might be a more complex underlying problem.
To further troubleshoot this situation, you could consider the following steps:
Check Logs: Examine the logs or error messages in ISE to gain more insight into the specific internal error that is occurring. This could provide more context about what is going wrong during the CSR deletion process.
Database Integrity: Verify the integrity of the ISE database. In some cases, database corruption or issues can lead to errors like this. You might want to perform database maintenance or integrity checks if applicable.
Permission Issues: Ensure that the user attempting to delete the CSR has the necessary permissions to perform this action. Insufficient permissions could lead to errors when trying to modify or delete objects.
Contact Support: If the issue persists, it might be wise to reach out to ISE support. They would have access to more advanced troubleshooting steps and can provide guidance specific to the version and configuration of your ISE instance.
Backup: Before attempting any further actions, consider creating a backup of the ISE configuration and relevant data to ensure you have a safe point to revert to in case anything goes wrong during troubleshooting.
Remember that the exact steps to resolve this issue can vary based on your specific ISE version, environment, and configuration
