The correct first step is to ask the user to update the data source credentials in the Power BI service dataset settings. This is because the “credentials invalid” error with Windows authentication almost always stems from a password change on the domain account used for the scheduled refresh—the stored credentials in the service become stale, and refreshing them restores connectivity without any gateway or server reconfiguration. On the PL-300 exam, this scenario tests your understanding of how Power BI handles Windows authentication for on-premises data sources, where the user’s identity is tied to Active Directory credentials rather than a shared account. A common trap is jumping to gateway troubleshooting or capacity changes, but the error message explicitly points to credential validity, not infrastructure. Remember the mnemonic “Password first, gateway last”—when Windows auth fails, always have the user re-enter their current domain password in the dataset settings before escalating.
PL-300 Manage and secure Power BI Practice Question
This PL-300 practice question tests your understanding of manage and secure power bi. 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.
You are a Power BI administrator. A user reports that their scheduled data refresh fails with error 'The data source credentials are no longer valid.' The dataset uses a SQL Server database with Windows authentication. What should you do first to resolve the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ask the user to update the data source credentials in the Power BI service dataset settings.
Option C is correct because the most common cause for Windows authentication failures is a password change; the user can update credentials in the dataset settings. Option A is wrong because the on-premises gateway is not necessarily the issue. Option B is wrong because impersonation does not apply to Windows credentials. Option D is wrong because capacity reassignment does not fix credential issues.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Reinstall the on-premises data gateway on the server.
Why it's wrong here
Reinstalling the gateway is unnecessary; the issue is credential-related.
✗
Reassign the dataset to a different Premium capacity.
Why it's wrong here
Capacity assignment does not affect credential validity.
✗
Modify the dataset to use 'Impersonate the authenticated user' for data sources.
Why it's wrong here
Impersonation is for web-based data sources, not Windows authentication.
✓
Ask the user to update the data source credentials in the Power BI service dataset settings.
Why this is correct
Windows credentials may expire; updating them in the service resolves the error.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PL-300 NAT questions on configuration and troubleshooting.
Manage and secure Power BI — This question tests Manage and secure Power BI — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Ask the user to update the data source credentials in the Power BI service dataset settings. — Option C is correct because the most common cause for Windows authentication failures is a password change; the user can update credentials in the dataset settings. Option A is wrong because the on-premises gateway is not necessarily the issue. Option B is wrong because impersonation does not apply to Windows credentials. Option D is wrong because capacity reassignment does not fix credential issues.
What should I do if I get this PL-300 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PL-300 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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