StartSSL Certifcate Install

[weather15]

When I follow these instructions Installing a StartSSL SSL Certificate with zmcertmgr - Zimbra :: Wiki to install a StartSSL Certificate I get this error:
** Saving server config key zimbraSSLPrivateKey...failed.
Then when I restart Zimbra I get this:
Starting ldap...Done.
Unable to determine enabled services from ldap.
Enabled services read from cache. Service list may be inaccurate.
Starting logger...Failed.
Starting logswatch...ERROR: service.FAILURE (system failure: ZimbraLdapContext) (cause: javax.net.ssl.SSLHandshakeException sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderE xception: unable to find valid certification path to requested target)
zimbra logger service is not enabled! failed.


Starting mailbox...Done.
Starting antispam...Done.
Starting antivirus...Done.
Starting snmp...Done.
Starting spell...Done.
Starting mta...Done.
Starting stats...Done.

Any idea about what to do?
Also at this time I can not access any of the web interfaces!

[weather15]

It seems that this corrected part of the problem: /opt/zimbra/java/bin/keytool -import -alias new -keystore /opt/zimbra/java/jre/lib/security/cacerts -storepass changeit -file /opt/zimbra/ssl/zimbra/commercial/commercial.crt

How can I get Zimbra to use AES 256 instead of AES 128?