Creating new SSL certificates to replace existing ones in a cell

To replace default Secure Socket Layer (SSL) certificates in an entire cell, you must create a new self-signed root certificate in the root keystore, DmgrDefaultRootStore, and replace the old root certificate with the new one.

1. Create the new SSL root certificate. Click Security > SSL certificate and key management > Key stores and certificates.
2. Under the Keystore usages pull-down, select Root certificate keystore.
3. Click the DmgrDefaultRootStore in the keystore usages list.
4. Under Additional Properties, select Personal certificates.
5. Under the Create pull-down, select Self-signed Certificate.
6. Enter a certificate and alias name.
   This can be any name you choose as long as the alias does not already exist. It is just a label to identify the certificate in the keystore.
7. In the Common name field, enter the fully qualified domain name of the computer where the WebSphere Application Server is installed.
   This is typically the hostname the node is running on.
8. Optional: Fill in any of the other Subject DN related fields.
   If you want the subject DN to look like the default subjectDN on WebSphere Application Server, then enter:
   • IBM in the Organization field.
   • <cell name>,ou=<node name> in the Organization unit field.
   • Under the Country or region pull-down, select US.
9. You can use the defaults for Root certificate used to sign the certificate, Key Size, and Validity Period or supply your own values.
10. Click Apply > Save.
    Note: You can also create a self-signed certificate using the createSelfSignedCertificate command. Read PersonalCertificateCommands command group for the AdminTask object for more information.

    You must now replace the old root certificate with the one you just created. The replace certificate option not only replaces the old default certificate with a new one but also replaces any occurrences of the signer of the old certificate with the signer of the new certificate. The configuration is also checked for references to the alias name of the old certificate and replaces it with the alias name of the new certificate. To replace the old certificate with the new one, complete the remaining steps.

11. Replace the old root certificate with the one you just created. In the Personal certificates page, select the check box for the older root certificate.
12. Click Replace.
13. From the Replace with list, choose the alias of the certificate you created.
14. Select Delete old certificate after replacement.
    Important: Be sure that the Delete old signer check box is not selected.
15. Click Apply > Save
16. Create a chained personal certificate in the default cell keystore: CellDefaultKeystore. In the Key stores and certificates page, Select the CellDefaultKeyStore of the node you want to change.
17. Under Additional Properties, select Personal certificates.
18. Select the default certificate of the node, usually called default.
19. Click Create > Chained certificate.
20. In the Alias field, enter a new personal certificate alias.
21. In the Root certificate used to sign the certificate pull-down list, select the alias root.
22. In the Common name field, enter the fully qualified domain name of the computer where the WebSphere Application Server is installed.
23. Click Apply > Save.
24. Replace the personal certificate in the default cell keystore: CellDefaulltKeystore. In the Personal certificates page, select the default check box.
25. Click Replace.
26. Select the certificate alias name for the new certificate you just created from the Replace with pull-down.
27. Select Delete old certificate after replacement.
    Important: Be sure that the Delete old signer check box is not selected.
28. Click Apply > Save