Question 650 of 928

Design and implement build and release pipelines →mediumMultiple ChoiceObjective-mapped

How to Troubleshoot 'Access to the Path is Denied' Error on Self-Hosted Agents

This AZ-400 practice question tests your understanding of design and implement build and release pipelines. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

Your Azure Pipelines build uses a self-hosted agent that runs on a Windows VM. The build fails with the error 'Access to the path 'C:\agent\_work\1\s\bin' is denied.' What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The agent service account does not have write permissions on the working directory
The agent runs under a service account that needs write access to the working directory.
B
The agent is not configured to use the correct agent pool
Why wrong: The agent is running, so it is configured correctly.
C
The build is trying to overwrite a file that is locked by another process
Why wrong: The error is about access denied, not file in use.
D
The source code checkout failed due to incorrect credentials
Why wrong: The error is about file access, not checkout.

Full breakdown with real-world context →

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 agent service account does not have write permissions on the working directory

The error 'Access to the path ... is denied' indicates a permissions issue. Self-hosted agents run under a specific Windows service account (e.g., Network Service, Local System, or a custom domain account). If that account lacks write permissions on the working directory (e.g., `C:\agent\_work\1\s\bin`), the agent cannot create or modify files during the build, causing the failure. This is the most common cause when using self-hosted agents on Windows VMs.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 agent service account does not have write permissions on the working directory
Why this is correct
The agent runs under a service account that needs write access to the working directory.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The agent is not configured to use the correct agent pool
Why it's wrong here
The agent is running, so it is configured correctly.
✗
The build is trying to overwrite a file that is locked by another process
Why it's wrong here
The error is about access denied, not file in use.
✗
The source code checkout failed due to incorrect credentials
Why it's wrong here
The error is about file access, not checkout.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may confuse a permissions error with a file-locking error (Option C), but Azure Pipelines specifically uses distinct error messages for each scenario, and 'access denied' always points to NTFS permissions, not file locks.

Detailed technical explanation

How to think about this question

Under the hood, the Azure Pipelines agent service runs as a Windows service, and its service account determines the security context for all file operations. The working directory (`_work`) is created by the agent during configuration, and by default, only the account that ran the configuration script (or the SYSTEM account) has full control. If the service account is later changed (e.g., from Local System to a domain user) without updating NTFS permissions, the new account will lack write access. In real-world scenarios, this often occurs after migrating the agent VM to a different domain or after a security policy change that restricts service account privileges.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this AZ-400 question test?

Design and implement build and release pipelines — This question tests Design and implement build and release pipelines — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The agent service account does not have write permissions on the working directory — The error 'Access to the path ... is denied' indicates a permissions issue. Self-hosted agents run under a specific Windows service account (e.g., Network Service, Local System, or a custom domain account). If that account lacks write permissions on the working directory (e.g., `C:\agent\_work\1\s\bin`), the agent cannot create or modify files during the build, causing the failure. This is the most common cause when using self-hosted agents on Windows VMs.

What should I do if I get this AZ-400 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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