Symptoms
Caution: This is a VxRail-specific article referencing the impact of Dell PowerEdge Server: TPM shows as Type '???-NTC' (Login as a Registered Dell user is required to view this article). Review it first for any new updates.
The operating system no longer shows the TPM as present even though it was installed and working fine previously. Further, checking the BIOS either in the iDRAC or directly booting in, shows up as '???-NTC'.This is verified under both 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 operation from booting. When it does, it shows a boot error purple screen with the below error:
Unable to restore system configuration. A security violation was detected. https://via.vmw.com/security-violation
Cause
The system board has lost communication with the TPM. This was only seen and reported in the field on 14G based VxRail nodes as of February 2023.
Resolution
A power drain resolves the issue. You can verify if this is resolved by viewing the TPM Version info:
If users continue to have the Security Violation, boot error purple screen after this, then investigate for a different cause.Review TPM BIOS settings and correct as necessary.
