SSE-Engineer Prisma Access Troubleshooting Practice Question
An enterprise deployment of Prisma Access utilizes Kerberos authentication for mobile users. Users report frequent authentication prompt failures when connecting via GlobalProtect from external networks. What is the most likely root cause of Kerberos authentication failure in this scenario?
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
✓
Lack of direct network line-of-sight or routing from the mobile user's remote location to the internal Active Directory Domain Controllers via a Service Connection.
Kerberos relies heavily on direct line-of-sight and UDP/TCP connectivity to Active Directory KDCs (Domain Controllers) along with valid service principal names (SPNs) and time synchronization.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
WildFire cloud subscription has expired.
Why it's wrong here
WildFire checks files for malware and has no impact on Kerberos tickets.
- ✗
The decryption policy is missing an inbound rule.
Why it's wrong here
Inbound decryption inspects incoming traffic to public servers, not outbound Kerberos authentication requests.
- ✗
The GlobalProtect client software license is invalid.
Why it's wrong here
Invalid licenses prevent client deployment or activation, not runtime Kerberos exchanges.
- ✓
Lack of direct network line-of-sight or routing from the mobile user's remote location to the internal Active Directory Domain Controllers via a Service Connection.
Why this is correct
Kerberos authentication requires direct communication between the client/gateway and the KDC; if Service Connections do not correctly route KDC traffic, authentication fails.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Palo Alto Networks exam blueprint
This SSE-Engineer 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 SSE-Engineer exam.