1Y0-312 Advanced Troubleshooting Practice Question
An administrator is investigating why a published application fails to launch for a subset of users in a Delivery Group, while other users in the same group can launch it successfully. The application is published from a machine catalog containing both server OS and desktop OS machines. The administrator has confirmed the Delivery Controllers are healthy and StoreFront enumerates the application for all affected users. Which TWO actions should the administrator take to isolate the cause? (Choose two.)
⚠ Common exam trap
The trap here is focusing on visibility or broker health when the application already enumerates and other users succeed, which points instead to a machine-level or application configuration problem.
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
✓
Check whether the affected users are being brokered to a machine where the application is not installed or is not in the allowed list
When only a subset of users fails to launch an application that enumerates correctly, the fault is usually tied to which machine the user is brokered to. Checking whether affected users land on machines lacking the application or excluded by the allowed list, and reviewing VDA event logs on those machines, isolates the machine-specific cause without disrupting healthy users.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Restart the Citrix Broker Service on all Delivery Controllers to clear any stale brokering state
Why it's wrong here
Restarting the Broker Service on healthy Controllers disrupts brokering for all users and does not target the subset-specific failure. Because other users in the same group launch the application successfully, the brokering service is functioning; the fault lies in the machine or application configuration reached by the affected users, not in stale broker state.
- ✓
Check whether the affected users are being brokered to a machine where the application is not installed or is not in the allowed list
Why this is correct
In a mixed catalog, an application can be published from machines where it is not actually present or is not in the application's allowed list. If brokering places affected users on such a machine, the launch fails for them while succeeding for users placed on properly configured machines, which explains the subset-specific failure in this scenario.
- ✗
Verify that the affected users are members of a group that is included in the application's 'Limit visibility' or tag restrictions
Why it's wrong here
Visibility restrictions affect whether the application appears in StoreFront at all. Since the administrator has already confirmed that StoreFront enumerates the application for all affected users, this is not the cause. Investigating visibility limits would not explain why the application appears but fails at launch time for a subset of users.
- ✓
Review the VDA event logs on the machines the affected users are brokered to for application launch errors
Why this is correct
VDA-side event logs record the specific failure when the VDA attempts to start the application for the session. Because the failure is subset-specific and likely tied to which machine the user lands on, reviewing the event logs on those specific machines reveals the concrete error, such as a missing executable or a launch permission problem.
- ✗
Recreate the machine catalog to force a clean re-registration of all VDAs in the Delivery Group
Why it's wrong here
Recreating the catalog is a disruptive action that does not address the root cause of a subset-specific launch failure. Registration state is already healthy because the application enumerates and other users can launch it. This action would cause unnecessary downtime without improving the diagnosis or resolving the underlying application configuration issue.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Citrix exam blueprint
This 1Y0-312 practice question is part of Courseiva's free Citrix 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 1Y0-312 exam.