The correct first step is to check the Access Control List (ACL) rules on the sys_user table for the integration user. A 403 Forbidden error from a REST API means the request reached ServiceNow but was denied authorization, not authentication—so credentials are fine, but the system’s permission layer is blocking the operation. Since the endpoint and credentials haven’t changed, the most likely culprit is that ACL rules on the sys_user table were modified, removing the integration user’s read or write access. On the ServiceNow Certified Application Developer CAD exam, this scenario tests your understanding that ACLs are the primary mechanism for controlling record-level access, and a sudden 403 often points to a rule change rather than a network or authentication issue. A common trap is to immediately suspect the REST endpoint or password reset, but the exam emphasizes that ACLs govern what a user can do with data after they’re authenticated. Memory tip: 403 = “Access Control List” — the three letters match the error code’s first digit, reminding you to check permissions first.
SNOW-CAD Integrating and managing application data Practice Question
This SNOW-CAD practice question tests your understanding of integrating and managing application data. 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.
A ServiceNow instance integrates with an external HR system via REST. The integration retrieves employee records and updates the 'sys_user' table. Recently, the integration started failing with '403 Forbidden' errors. The REST API endpoint and authentication credentials have not changed. Which action should the administrator take 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
✓
Check the Access Control List (ACL) rules on the sys_user table for the integration user.
A 403 Forbidden error indicates that the server understood the request but is refusing to authorize it. Since the REST endpoint and credentials haven't changed, the most likely cause is that the integration user's access rights within ServiceNow have been altered, specifically the Access Control List (ACL) rules on the 'sys_user' table. The administrator should first check these ACLs to ensure the integration user still has the necessary read/write permissions.
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.
✗
Review the inbound REST message configuration for rate limiting settings.
Why it's wrong here
Rate limiting typically returns 429 Too Many Requests, not 403.
✗
Reset the password for the integration user in the external system.
Why it's wrong here
Credentials are unchanged; resetting password is not the first step.
✓
Check the Access Control List (ACL) rules on the sys_user table for the integration user.
Why this is correct
A 403 error indicates forbidden access; ACLs or user permissions are the most common cause.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Verify the REST API endpoint URL in the integration record.
Why it's wrong here
The endpoint hasn't changed, so this is unlikely the issue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing a 403 Forbidden with a 401 Unauthorized or a connectivity issue, leading candidates to focus on credentials or endpoint URLs instead of the authorization layer within ServiceNow's ACLs.
Detailed technical explanation
How to think about this question
ServiceNow ACLs are evaluated based on the 'type' (record, field, scripted) and the 'operation' (create, read, write, delete). For a REST API integration, the system processes the request under the context of the integration user's roles; if a 'write' ACL on the 'sys_user' table is missing or has a 'condition' that fails, the platform returns a 403. This is distinct from HTTP Basic Auth or OAuth failures, which would return a 401 Unauthorized.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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.
Integrating and managing application data — This question tests Integrating and managing application data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check the Access Control List (ACL) rules on the sys_user table for the integration user. — A 403 Forbidden error indicates that the server understood the request but is refusing to authorize it. Since the REST endpoint and credentials haven't changed, the most likely cause is that the integration user's access rights within ServiceNow have been altered, specifically the Access Control List (ACL) rules on the 'sys_user' table. The administrator should first check these ACLs to ensure the integration user still has the necessary read/write permissions.
What should I do if I get this SNOW-CAD 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: "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?
Read the scenario before looking for a memorised answer.
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Question Discussion
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