Configure the LTPA mechanism

Configure LTPA or Kerberos when we set up security for the first time.

Tasks

1. Open the administrative console.
   http://fully_qualified_host_name:port_number/ibm/console

   Port 9060 is the default port number.

2. Click...
   Security > Global security > Authentication mechanisms and expiration > LTPA

3. Select the appropriate group from the Key set group field containing your public, private, and shared LTPA keys. These keys are used to encrypt and decrypt data sent between servers. We can access these key set group configurations using the Key set group link. In the Key set group configuration, we can indicate whether to automatically generate new keys and when to generate them.

4. Enter a positive integer in the LTPA timeout value for forwarded credentials between servers field.

   This value refers to how long the server credentials from another server are valid before they expire. The default is 120 minutes. The value must be greater than the value in the Cache timeout field on the Authentication cache settings panel.

5. Enter a password in the Password field.

   This password is used to protect the generated keys used to encrypt and decrypt the LTPA keys from the SSO properties file. The password is not used to generate keys; it is only used to protect them. During import, this password should match the password used to export the keys at another LTPA server (for example, another application server Cell, Lotus Domino Server, and so on). During export, remember this password in order to provide it during the import operation.

   Single sign-on across cells can be provided by sharing keys and passwords. To share the keys and password, log on to one cell, specify a key file, and click Export keys. Then, log on to the other cell, specify the key file, and click Import keys.

6. Click Apply or OK.

7. Optional: Review the settings on the panel...
   Global security > Authentication cache settings

   By default, the authentication cache is enabled.

The LTPA configuration is now set. The LTPA keys are generated automatically the first time. Do not generate the LTPA keys in this step because they are automatically generated later. Proceed with the rest of the steps required to enable security, and start with single sign-on (SSO), if it is required.

What to do next

After configuring LTPA, we can also complete the following tasks:

1. Generate key files.
2. Export key files.
3. Import key files.
4. Manage LTPA keys from multiple cells.

5. If we are enabling security, we can also enable single sign-on (SSO). See:
   • (iSeries) Configure SSO capability with Enterprise Identity Mapping
   • Configure SSO capability with ISAM WebSEAL

6. If we generated a new set of keys or imported a new set of keys, verify that the keys are saved to the master configuration by clicking Save on the panel. Because LTPA authentication uses time-sensitive tokens, verify that the time, date, and time zone are synchronized among all of the product servers that are participating in the protected domain. Changes to the time, date, and time zone are done independently from WAS. If the clock skew is too high between servers, the LTPA token seems prematurely expired and causes authentication or validation failures.

Subtopics

• LTPA
  Specify the shared keys and configure the authentication mechanism used to exchange information between servers. We can also use this page to specify the amount of time that the authentication information remains valid and specify the single sign-on configuration.

Related:

Single sign-on for authentication using LTPA cookies

Trust associations

LTPA key sets and key set groups

Enable security

Select a registry or repository

Authentication cache settings