I am a new bee to linux and zimbra. As we need one mail solution we opted for ubutu with zimbra. I have successfully installed both OS and zimbra. The server behind a router(i.e using NAT). I have used zmtlsctl command for using https. The https is working fine inside LAN, only giving a waring for the certificate. When i tried to acces the webclient through internet, IE is not connecting but firefox throws and error "SSL received a malformed Certificate handshake message." If i use http: there is no problem. I am using port forwarding in the router and any request on port 443 is routed to zimbra's IP. Do any one now how to solve this issue.