PCNSE Secure Access and VPN Practice Question
A remote user reports they cannot connect to the corporate network via GlobalProtect. The GlobalProtect client shows 'Connection failed. Unable to establish a secure connection.' The portal and gateway are configured with certificate authentication. The administrator verifies that the portal/gateway certificates are valid and not expired, and the common name matches the portal's FQDN. The client's machine time is synchronized. Which configuration misconfiguration is most likely the cause?
⚠ Common exam trap
The trap here is that candidates often focus on certificate validity or time synchronization, but the real issue is a TLS protocol version mismatch caused by an outdated client, which is a common oversight in PAN-OS environments where TLS 1.2 is enforced.
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 client's GlobalProtect app is an older version that does not support TLS 1.2.
The error 'Unable to establish a secure connection' indicates a TLS handshake failure. If the GlobalProtect client is an older version that does not support TLS 1.2, but the portal/gateway requires TLS 1.2 (as is common in modern PAN-OS configurations), the handshake will fail even though certificates are valid and time is synchronized. This is a classic version incompatibility issue where the client cannot negotiate a mutually supported TLS protocol version.
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 client's GlobalProtect app is an older version that does not support TLS 1.2.
Why this is correct
An older client may not support TLS 1.2, causing the connection to fail if the gateway requires it.
- ✗
The gateway authentication profile is set to use RADIUS instead of certificate.
Why it's wrong here
Authentication profile is not used during TLS handshake; it's used after tunnel establishment.
- ✗
The portal is configured with an incorrect server certificate common name (CN) that does not match the portal's FQDN.
Why it's wrong here
The administrator already verified that the CN matches the FQDN.
- ✗
The GlobalProtect gateway is configured to require HIP match, but the user's endpoint does not meet the HIP profile.
Why it's wrong here
HIP mismatch results in a post-connection error, not a secure connection failure.
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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.