We run zimbra network editionv 7.1.1., the server works fine. I want to add an account in zimbra desktop 7

- account type : zimbra
- sceurity : SSL, port : 443

then I got error :

Cannot connect to "https://xxx.xxx.xxx/service/soap/". Please check host/port and network connectivity.

I already change webmail protocol to both mode :
#zmtlsctl both
#zmcontrol stop
#zmcontrol start

also the webmail https://xxx.xxx.xxx/ is fail too but the http://xxx.xxx.xxx works.

Please advise.