i have installed Zimbra Collaboration Server - Open Source Edition, on ubuntu 12.04

all went fine and i followed an online tutorial, but i cant connect to the server nor using the ip neither the admin panel
i get this error:

Unable to connect

Firefox can't establish a connection to the server at xx.xx.xx.xx

i have disabled the firewall on the server still having the same problem

when i run zmcontrol i can see that mysql is turned off

any solution for this?