Quick Answer
The correct answer is that the user account is intentionally disabled for login. When a user’s shell is set to /sbin/nologin in /etc/passwd, the system does not allow interactive shell access; instead, it immediately exits with a message like “This account is currently not available.” This is a deliberate configuration used to disable login for system accounts such as daemon or bin, or for a regular user whose access needs to be revoked without deleting their home directory or files. On the Red Hat Certified System Administrator EX200 exam, this concept tests your understanding of how Linux manages user authentication and shell assignments, often appearing in troubleshooting scenarios where a user cannot log in despite a valid password. A common trap is confusing /sbin/nologin with /bin/false, but the key difference is that /sbin/nologin provides a polite message while /bin/false silently returns a non-zero exit code. Memory tip: think of “nologin” as “no login allowed”—the shell itself says “no” to interactive access.
This EX200 practice question tests your understanding of deploy, configure, and maintain systems. 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 user reports that they cannot log in to a RHEL 9 system. The administrator checks /etc/passwd and finds the user's shell is set to /sbin/nologin. 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.
The SSH service is not running.
Why wrong: SSH service would affect all users.
The user account has been locked by pam_tally2.
Why wrong: Locked accounts are indicated differently.
The user's password has expired.
Why wrong: Password expiration is stored in /etc/shadow.
The user account is intentionally disabled for login.
/sbin/nologin prevents interactive login.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The user account is intentionally disabled for login.
The /sbin/nologin shell is a valid shell entry that, when set as a user's login shell, prevents interactive login by immediately exiting with a message that the account is not available. This is a standard method for disabling login for system accounts (e.g., daemon, bin) or intentionally disabling a user account while keeping the account and its files intact. Option D correctly identifies that the user account is intentionally disabled for login.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The SSH service is not running.
Why it's wrong here
SSH service would affect all users.
The user account has been locked by pam_tally2.
Why it's wrong here
Locked accounts are indicated differently.
The user's password has expired.
Why it's wrong here
Password expiration is stored in /etc/shadow.
The user account is intentionally disabled for login.
Why this is correct
/sbin/nologin prevents interactive login.
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.
Common exam traps
The trap here is that candidates may confuse the /sbin/nologin shell with account locking or password expiration, not realizing that the shell setting is a deliberate, static configuration to disable interactive login without affecting password state or authentication attempts.
Detailed technical explanation
The /sbin/nologin shell is defined in /etc/shells and is used by system accounts (e.g., ftp, apache) to prevent interactive login. When a user with this shell attempts to log in via SSH or console, the login process executes the shell, which prints 'This account is currently not available.' and exits. This is distinct from account locking (via usermod -L or passwd -l), which sets an exclamation mark in the password hash field of /etc/shadow, or from password expiration, which triggers a password change prompt.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the EX200 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Deploy, configure, and maintain systems — This question tests Deploy, configure, and maintain systems — Read the scenario before looking for a memorised answer..
The correct answer is: The user account is intentionally disabled for login. — The /sbin/nologin shell is a valid shell entry that, when set as a user's login shell, prevents interactive login by immediately exiting with a message that the account is not available. This is a standard method for disabling login for system accounts (e.g., daemon, bin) or intentionally disabling a user account while keeping the account and its files intact. Option D correctly identifies that the user account is intentionally disabled for login.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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