A Samba server authenticates users against an LDAP backend. Some users can authenticate, but others cannot, and the error log shows 'NT_STATUS_NO_SUCH_USER' for the failing users. The administrator verifies the users exist in LDAP. What is the most likely cause?

The failing users are in a different LDAP subtree that is not included in the Samba search base.

The failing users have expired passwords in LDAP.

The LDAP server is rejecting connections from the Samba server's IP address.

The Samba server's 'passdb backend' is incorrectly configured to use tdbsam instead of LDAP.

An older Linux client cannot connect to a Samba server that is configured with 'server min protocol = SMB3'. What is the most likely cause of the connection failure?

The client only supports SMB1, which is below the server's minimum

The server's 'valid users' parameter excludes the client

The server's DNS is misconfigured

The client's firewall is blocking port 445

A user can authenticate to a Samba share but cannot create new files, receiving an 'Access Denied' error. The administrator checks the share's permissions and confirms the user has write access in smb.conf. What should the administrator check next?

The POSIX file system permissions on the underlying directory.

The SMB protocol version, which may not support file creation on the client.

The Samba log level, which may be too low to capture the authentication failure.

The 'valid users' parameter in smb.conf, which may exclude the user from write access.

A Samba administrator recently edited /etc/samba/smb.conf to add a new share. After restarting the smbd service, clients cannot see the new share. The administrator runs testparm and sees no syntax errors, but the new share is not listed in the output. What should the administrator do next?

Use smbclient -L localhost to verify the share is visible to the local client before checking the configuration.

Run testparm -v to display all effective parameters and verify the share is loaded.

Check the Samba log files for errors related to the share definition and verify the file was saved in the correct location.

Increase the debug level in smb.conf to 5 and restart Samba to capture more detailed configuration parsing information.

LPIC-3 Mixed Environments

Domain 3Objective 4

392.4 Troubleshooting Samba (weight: 2) LPIC-3-MIXED-ENVIRONMENTS Practice Questions (Page 2)

Part of the Topic 392: Samba Basics domain, which makes up ~24% of our current practice bank. Linux Professional Institute does not publish an official question count, but from its 90-minute exam (~35–60 total, ~8–14 in this domain), expect 2–3 from this objective — we provide 41 practice questions to prepare you well beyond it. (estimate)

41questions here

9free pages

12concepts

12 Concepts in This Objective

Identify Samba log files and log levels
Use testparm to validate configuration
Use smbclient for connectivity testing
Use smbstatus to monitor active connections
Troubleshoot name resolution issues
Troubleshoot authentication and permission problems
Troubleshoot network and firewall issues
Troubleshoot SMB protocol and dialect mismatches
Troubleshoot printing problems
Troubleshoot file locking and share mode issues
Use Samba debugging tools and techniques
Interpret Samba error messages and logs

Questions 6–10

6expert · hard
A Samba server authenticates users against an LDAP backend. Some users can authenticate, but others cannot, and the error log shows 'NT_STATUS_NO_SUCH_USER' for the failing users. The administrator verifies the users exist in LDAP. What is the most likely cause?
Select an answer first
7foundation · easy
An older Linux client cannot connect to a Samba server that is configured with 'server min protocol = SMB3'. What is the most likely cause of the connection failure?
Select an answer first
8foundation · easy
A Samba client cannot connect to the server, and the administrator suspects a firewall is blocking traffic. Which TCP port is used by SMB for file sharing and must be open?
Select an answer first
9application · medium
A user can authenticate to a Samba share but cannot create new files, receiving an 'Access Denied' error. The administrator checks the share's permissions and confirms the user has write access in smb.conf. What should the administrator check next?
Select an answer first
10application · medium
A Samba administrator recently edited /etc/samba/smb.conf to add a new share. After restarting the smbd service, clients cannot see the new share. The administrator runs testparm and sees no syntax errors, but the new share is not listed in the output. What should the administrator do next?
Select an answer first

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