Resolvendo o problema Cannot connect to the ZCS upstream server Connection is refused no Zimbra

O objetivo deste post é de apresentar o problema ZCS upstream server connection is refused no Zimbra e a respectiva solução.

Ocorreu uma vez a seguinte mensagem de erro no servidor Zimbra.

Problema

"Problem accessing ZCS upstream server. 
Cannot connect to the ZCS upstream server. Connection is refused.
Possible reasons:
upstream server is unreachable
upstream server is currently being upgraded
upstream server is down
Please contact your ZCS administrator to fix the problem.
Powered by Nginx-Zimbra://"

Solução

Geralmente isso ocorre com arquivo de log, necessário limpar, parando todos os serviços do Zimbra e iniciando novamente.

$ su zimbra
$ zmcontrol stop
$ zmcontrol start
$ zmcontrol status

Parando os serviços

zimbra@zimbra-server:~/nginx/logs$ zmcontrol stop  
 Host zimbra-server.saitam.com  
      Stopping vmware-ha...skipped.  
           /opt/zimbra/bin/zmhactl missing or not executable.  
      Stopping zmconfigd...Done.  
      Stopping zimlet webapp...Done.  
      Stopping zimbraAdmin webapp...Done.  
      Stopping zimbra webapp...Done.  
      Stopping service webapp...Done.  
      Stopping stats...Done.  
      Stopping mta...Done.  
      Stopping spell...Done.  
      Stopping snmp...Done.  
      Stopping cbpolicyd...Done.  
      Stopping archiving...Done.  
      Stopping opendkim...Done.  
      Stopping amavis...Done.  
      Stopping antivirus...Done.  
      Stopping antispam...Done.  
      Stopping proxy...Done.  
      Stopping memcached...Done.  
      Stopping mailbox...Done.  
      Stopping logger...Done.  
      Stopping dnscache...Done.  
      Stopping ldap...Done.  

Iniciando os serviços

zimbra@zimbra-server:~/nginx/logs$ zmcontrol start  
 Host zimbra-server.saitam.com  
      Starting ldap...Done.  
      Starting zmconfigd...Done.  
      Starting logger...Done.  
      Starting mailbox...Done.  
      Starting memcached...Done.  
      Starting proxy...Done.  
      Starting amavis...Done.  
      Starting antispam...Done.  
      Starting antivirus...Done.  
      Starting opendkim...Done.  
      Starting snmp...Done.  
      Starting spell...Done.  
      Starting mta...Done.  
      Starting stats...Done.  
      Starting service webapp...Done.  
      Starting zimbra webapp...Done.  
      Starting zimbraAdmin webapp...Done.  
      Starting zimlet webapp...Done.  

Verificando o status dos serviços

 zimbra@Saitam:~/nginx/logs$ zmcontrol status  
 Host zimbra-server.saitam.com  
      amavis         Running  
      antispam        Running  
      antivirus        Running  
      ldap          Running  
      logger         Running  
      mailbox         Running  
      memcached        Running  
      mta           Running  
      opendkim        Running  
      proxy          Running  
      service webapp     Running  
      snmp          Running  
      spell          Running  
      stats          Running  
      zimbra webapp      Running  
      zimbraAdmin webapp   Running  
      zimlet webapp      Running  
      zmconfigd        Running  

Antes

Depois

Feito!