I was trying to check my mail queue but when i clic on the option at the admin console, i got this error:

Mensaje: system failure: exception during auth {RemoteManager: syncmail.sync.com.ec->zimbra@syncmail.sync.com.ec:22}
Código de error: service.FAILURE
Method: ZmCsfeCommand.prototype.invoke

all other functionalities works fine, but in every tab of the mail queue module i got error instead of the number of mails in each state, any idea? thanks any help