故障现象：
#su - zimbra
$zmcontral status
提示：
Unable to determine enabled services from ldap.
Enabled services read from cache. Service list may be inaccurate.
出现这些情况的原因主要有四种，很可能为证书过期或失效这种原因，解决这个问题的方法其实也非常简单，就是重新签发ZCS证书即可，下面就讲一下证书签发的过程及情况，其他原因造成ZCS因LDAP问题无法启动部分服务的原因我会有空时发帖总结，谢谢支持。
分为两种情况：
一 ZCS服务正常，但想延长证书使用的时间；
用root执行里下命令，签发一个可以使用20年的证书。
执行完成后重启postfix服务即可生效，命令为：#postfix reload。
二 、如果ZCS服务已经无法全部启动，那么先停止ZCS服务，执行以上命令后，再启动ZCS服务即可。
经测试，签发20年的证书全部成功，签发50年的证书可能会失败。
下面为签发的过程（此过程中有部分failed，仅供参考，实际成功签发时代码不同）：
[root@mail ~]# /opt/zimbra/bin/zmcertmgr createca -new
** Creating /opt/zimbra/ssl/zimbra/ca/zmssl.cnf...done
** Creating CA private key /opt/zimbra/ssl/zimbra/ca/ca.key...done.
** Creating CA cert /opt/zimbra/ssl/zimbra/ca/ca.pem...done.
[root@mail ~]# /opt/zimbra/bin/zmcertmgr deployca
** Importing CA /opt/zimbra/ssl/zimbra/ca/ca.pem into CACERTS...done.
** Saving global config key zimbraCertAuthorityCertSelfSigned...failed.
** Saving global config key zimbraCertAuthorityKeySelfSigned...failed.
** Copying CA to /opt/zimbra/conf/ca...done.
[root@mail ~]# /opt/zimbra/bin/zmcertmgr createcrt -new -days 7300
Validation days: 7300
** Creating /opt/zimbra/conf/zmssl.cnf...done
** Backup /opt/zimbra/ssl/zimbra to /opt/zimbra/ssl/zimbra.20130813223625
** Generating a server csr for download self -new -keysize 1024
** Creating /opt/zimbra/conf/zmssl.cnf...done
** Backup /opt/zimbra/ssl/zimbra to /opt/zimbra/ssl/zimbra.20130813223625
** Retrieving Commercial CA cert from ldap...failed.
** Creating server cert request /opt/zimbra/ssl/zimbra/server/server.csr...done.
** Saving server config key zimbraSSLPrivateKey...failed.
** Signing cert request /opt/zimbra/ssl/zimbra/server/server.csr...done.
[root@mail ~]# /opt/zimbra/bin/zmcertmgr deploycrt self
** Saving server config key zimbraSSLCertificate...failed.
** Saving server config key zimbraSSLPrivateKey...failed.
** Installing mta certificate and key...done.
** Installing slapd certificate and key...done.
** Installing proxy certificate and key...done.
** Creating pkcs12 file /opt/zimbra/ssl/zimbra/jetty.pkcs12...done.
** Creating keystore file /opt/zimbra/mailboxd/etc/keystore...done.
** Installing CA to /opt/zimbra/conf/ca...done.
[root@mail ~]# /opt/zimbra/bin/zmcertmgr viewdeployedcrt
::service mta::
notBefore=Aug 13 14:36:34 2013 GMT
notAfter=Aug 8 14:36:34 2033 GMT
subject= /C=US/ST=N/A/O=Zimbra Collaboration Suite/OU=Zimbra Collaboration Suite/CN=mail.test.gd.cn
issuer= /C=US/ST=N/A/L=N/A/O=Zimbra Collaboration Suite/OU=Zimbra Collaboration Suite/CN=mail.test.gd.cn
SubjectAltName=
::service proxy::
notBefore=Aug 13 14:36:34 2013 GMT
notAfter=Aug 8 14:36:34 2033 GMT
subject= /C=US/ST=N/A/O=Zimbra Collaboration Suite/OU=Zimbra Collaboration Suite/CN=mail.test.gd.cn
issuer= /C=US/ST=N/A/L=N/A/O=Zimbra Collaboration Suite/OU=Zimbra Collaboration Suite/CN=mail.test.gd.cn
SubjectAltName=
::service mailboxd::
notBefore=Aug 13 14:36:34 2013 GMT
notAfter=Aug 8 14:36:34 2033 GMT
subject= /C=US/ST=N/A/O=Zimbra Collaboration Suite/OU=Zimbra Collaboration Suite/CN=mail.test.gd.cn
issuer= /C=US/ST=N/A/L=N/A/O=Zimbra Collaboration Suite/OU=Zimbra Collaboration Suite/CN=mail.test.gd.cn
SubjectAltName=
::service ldap::
notBefore=Aug 13 14:36:34 2013 GMT
notAfter=Aug 8 14:36:34 2033 GMT
subject= /C=US/ST=N/A/O=Zimbra Collaboration Suite/OU=Zimbra Collaboration Suite/CN=mail.test.gd.cn
issuer= /C=US/ST=N/A/L=N/A/O=Zimbra Collaboration Suite/OU=Zimbra Collaboration Suite/CN=mail.test.gd.cn
SubjectAltName=
[root@mail ~]# ::service ldap::
-bash: ::service: command not found
[root@mail ~]# su - zimbra
[zimbra@mail ~]$ zmcontrol start
Host mail.test.gd.cn
Starting ldap...Done.
Starting zmconfigd...Done.
Starting logger...Done.
Starting mailbox...Done.
Starting antispam...Done.
Starting antivirus...Done.
Starting snmp...Done.
Starting spell...Done.
Starting mta...Done.
Starting stats...Done.
You have new mail in /var/spool/mail/zimbra