1Y0-312 Advanced Troubleshooting Practice Question
A VDA in a non-persistent pooled catalog fails to register with the Delivery Controller after a reboot. The event log shows 'Registration failed because the VDA could not find a Delivery Controller'. Which configuration file on the VDA should the administrator inspect to verify the list of Controllers?
⚠ Common exam trap
Candidates frequently check Active Directory group membership or local Windows firewall rules first, overlooking the critical VDA-to-Controller registration configuration stored in the local registry.
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 Registry key: HKLM\Software\Citrix\VirtualDesktopAgent\ListOfDDCs.
When a VDA fails to register, the first point of check is the list of Controllers defined in the registry or the local configuration file. The VDA uses the list defined in the 'ListOfDDCs' registry key located under HKLM\Software\Citrix\VirtualDesktopAgent. Verifying this key ensures that the VDA is attempting to contact the correct Delivery Controller FQDNs or IP addresses, as misconfiguration here is a leading cause of registration failures.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
C:\Program Files\Citrix\BrokerAgent\BrokerAgent.exe.config
Why it's wrong here
This file contains settings for the broker agent service itself but is not the primary location for the Controller list. Modifying or inspecting this file is generally not required for standard troubleshooting, as the broker agent relies on the registry-based ListOfDDCs for its core connectivity information.
- ✓
The Registry key: HKLM\Software\Citrix\VirtualDesktopAgent\ListOfDDCs.
Why this is correct
This registry value is the authoritative source for the VDA to locate the Delivery Controllers. If this key is empty, misconfigured, or contains unreachable addresses, the VDA will fail to register. Inspecting this value directly confirms whether the VDA has received the correct configuration from the master image.
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C:\ProgramData\Citrix\GroupPolicy\Policy.xml
Why it's wrong here
This file stores local policy caches but is not used by the VDA to determine the address of the Delivery Controller. While group policies can influence VDA behavior, the specific registration target is determined by the ListOfDDCs registry key, not by the local policy storage file.
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The C:\Windows\System32\Drivers\etc\hosts file.
Why it's wrong here
The hosts file is used for DNS resolution and might be a factor if DNS is failing, but it is not the configuration file for the VDA controller list. Checking this file is a general network troubleshooting step, but the specific Citrix VDA registration configuration is held elsewhere.
About these practice questions
Courseiva writes every 1Y0-312 question from scratch — 186 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.