Identify and Fix LDAP and Kerberos Identity Management Issues

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Identify and Fix LDAP and Kerberos Identity Management Issues

In this exercise, you will troubleshoot and resolve authentication issues with both LDAP and Kerberos. *This course is not approved or sponsored by Red Hat.*

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Lab Info

Level

Advanced

Last updated

Nov 02, 2025

Duration

1h 30m

Challenge

Verify LDAP and Kerberos logins on Server1.
On Server1 (10.0.1.10)

Attempt to SSH in as testuser01 and receive a Kerberos ticket:
```
ssh testuser01@localhost
```
```
kinit
```
LDAP seems functional, but Kerberos is broken. View the Kerberos config:
```
cat /etc/krb5.conf
```
Modify /etc/krb5.conf:
```
vim /etc/krb5.conf
```
Change EXAMPLE_COM to EXAMPLE.COM.

Use authconfig to enable Kerberos logins:
```
authconfig-tui
```
SSH in as testuser01 and receive a Kerberos ticket:
```
ssh testuser01@localhost
```
```
kinit
```
```
klist
```
Challenge

Verify LDAP and Kerberos logins on Server2.
On Server2 (10.0.1.11)

Attempt to SSH in as testuser01:
```
ssh testuser01@localhost
```
Use getent to retrieve account information about testuser01:
```
getent passwd testuser01
```
Verify LDAP and Kerberos logins are enabled:
```
cat /etc/sysconfig/authconfig
```
User authconfig-tui to modify LDAP settings:
```
authconfig-tui
```
Use getent to retrieve account information about testuser01:
```
getent passwd testuser01
```
SSH in as testuser01 and receive a Kerberos ticket:
```
ssh testuser01@localhost
```
```
kinit
```
```
klist
```

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