My zimbra server stopped working this night.

[zimbra@mail root]$ zmcontrol start
Host mail.ecoconcept.eu
Starting ldap...Done.
Unable to determine enabled services from ldap.
Enabled services read from cache. Service list may be inaccurate.
Starting zmconfigd...Done.
Starting logger...Failed.
Starting logswatch...ERROR: service.FAILURE (system failure: ZimbraLdapContext) (cause: javax.net.ssl.SSLHandshakeException sun.security.validator.ValidatorException: PKIX path validation failed: java.security.cert.CertPathValidatorException: timestamp check failed)
zimbra logger service is not enabled! failed.


Starting mailbox...Done.
Starting memcached...Done.
Starting imapproxy...Done.
Starting antispam...Done.
Starting antivirus...Done.
Starting snmp...Done.
Starting spell...Done.
Starting mta...Failed.
Starting saslauthd...saslauthd[7822] :set_auth_mech : failed to initialize mechanism zimbra
failed.
zmsaslauthdctl failed to start


Starting stats...Done.