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: If the fetch fails, try reducing the management interface MTU (e.g., to 1374) to avoid fragmentation issues. 3. Advanced Remediation (TAC Intervention)
Wait about 30 minutes for the changes to propagate through the cloud before retrying. Step 5: Force a Re-Sync via PowerShell
On the provisioning server (e.g., EST, Azure DPS, AWS IoT): : If the fetch fails, try reducing the
| Module | Change | |--------|--------| | | Add function tpm_get_current_public_key() that reads the actual key from TPM (not cached). | | Certificate Store | Store (tpm_key_handle, cert_serial, public_key_hash) mapping. | | Error Handler | Catch TPM_KEY_MISMATCH and trigger force_renew=True . | | Provisioning Client | Add force_renewal flag to ignore cached public key and re-register. |
def get_device_certificate(): try: # Step 1: Try to fetch existing certificate using current TPM key cert = fetch_cert_from_server(tpm_public_key()) return cert except TPMKeyMismatchError: # Step 2: Mismatch detected logger.warning("TPM public key mismatch – triggering re-enrollment") # Step 3: Generate a new TPM key (or reuse existing if valid) new_tpm_key = tpm_create_or_load_key() Step 5: Force a Re-Sync via PowerShell On
The TPM firmware or BIOS is out of date, causing communication errors during the handshake process.
"Let's trace the logic," Sarah said, forcing a clinical calm she didn't feel. She pulled up the diagnostic logs. "Step one: The terminal requests a session. Step two: Mother asks for the device certificate to prove we are who we say we are. Step three: The terminal instructs the TPM to sign the request with its private key." | | Provisioning Client | Add force_renewal flag
"What about the lockout?" Sarah asked.
