Open PowerShell as Administrator:
Summary
Find the certificate intended for Palo Alto. Double-click it > > Public Key . Note the key size and algorithm (e.g., RSA 2048). Then check if any OTHER certificate with the same issuer/SAN exists. Delete duplicates. Then check if any OTHER certificate with the
Change the MTU value from its default ( 1500 ) down to a lower size, such as or 1400 . Commit the changes and retry fetching the certificate.
In the world of network security, the error "Failed to fetch device certificate: TPM public key match failed" is the digital equivalent of a "lockout" where the key you’re holding no longer fits the lock it was made for. Commit the changes and retry fetching the certificate
This can clear up transient state inconsistencies. One user reported success by simply doing a commit force after a failed fetch, which caused the device certificate to download properly. This is a low-risk step and should be attempted before more invasive procedures.
: A device reboot is typically required to clear the temporary .pub_pem files and allow a new certificate fetch. 5. Technical Support Intervention checking for duplicate certificates
Palo Alto Networks firewalls use a for secure communication with cloud services. This certificate is crucial for: Telemetry data
Clear-Tpm -Allowed $true
Re-engage the firewall Command Line Interface (CLI) to execute a manual fetch:
By following the structured approach above—verifying TPM health, checking for duplicate certificates, adjusting GlobalProtect settings, and knowing when to reset—you can resolve this error in under 30 minutes and restore secure, hardware-backed authentication to your Palo Alto environment.
