Error: {'desc': "Can't contact LDAP server"}

==== Required information ====
- iRedMail version: 0.8.4
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Linux/BSD distribution name and version: Ubuntu 12.10
- Related log if you're reporting an issue:
====

Hi,

I just created a clean installation, I tried LDAP as the backend this time. When tring to login to iredadmin portal I get this error:

Error: {'desc': "Can't contact LDAP server"}

I don't even know where to begin troubleshooting. Any ideas?