Symptoms
The operating system no longer shows the TPM as present even though it was installed and working fine previously. Further, checking either BIOS - either in the iDRAC or directly booting in - shows up as '???-NTC' under TPM Information.This can be verified both under the iDRAC BIOS settings (Configuration -> BIOS Settings -> System Security) or using the F2 boot (System Setup -> BIOS Settings -> System Security) For systems configured with Secure Boot, this can prevent the operating system from fully booting.
Cause
The system board has lost communication with the TPM.
This has only been seen and reported in the field only on 14G based PowerEdge as of February 2023.
Resolution
A power drain resolves the issue.This can be either achieved remotely using the Full Power Cycle in the BIOS or a physical power drain.The Full Power Cycle is under the BIOS's Miscellaneous settings.
If customers continue to have the Security Violation PSOD after this, then please investigate for a different cause.
TPM BIOS settings may need to be corrected as sometimes this gets reset to defaults.
