First thing to check if port 443 is open on zimbra server that BES points to. zcb is using this port to sync GAL from zimbra server. Please use telnet mailnode 443 and determine if connection can be established. If not, port 443 can be opened using server command 'zmtlsctl both'.
Please also note that BB manager and BB controller have to be restarted afetr above port is opened. |