PCNSE Practice Question: Securing Users and Applications with Authentication
An organization has deployed GlobalProtect with certificate authentication. Users on macOS report that after updating their client, they cannot connect and see error 'Certificate validation failed: The certificate hash does not match.' What is the most likely cause?
⚠ Common exam trap
Watch out — candidates often confuse certificate pinning failures with general certificate validation issues (like trust or expiry), but the specific error message 'certificate hash does not match' is unique to pinning and not to standard PKI validation steps.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The certificate pinning configuration on the gateway has a hash mismatch
The error 'Certificate validation failed: The certificate hash does not match' specifically indicates a certificate pinning mismatch. GlobalProtect certificate pinning allows the gateway to enforce that the client's certificate matches a specific hash (SHA-256 fingerprint). When the client updates, its certificate may change (e.g., due to a new key pair or renewal), causing the hash stored in the gateway's pinning configuration to no longer match, resulting in this exact error.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The certificate pinning configuration on the gateway has a hash mismatch
Why this is correct
Certificate pinning enforces specific hash; client update may change the hash.
- ✗
The root CA certificate is not trusted on the client
Why it's wrong here
Root CA trust issue would show untrusted root error.
- ✗
The CRL is not reachable
Why it's wrong here
CRL issues cause revocation errors, not hash mismatch.
- ✗
The GlobalProtect gateway certificate is expired
Why it's wrong here
Expired certificate would show a different error about validity.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNSE practice question is part of Courseiva's free Palo Alto Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNSE exam.