Unable to sort out AWS networking for LDAP

[TeleSouth]

Good Morning,

I am needing some help with sorting out Lightsail networking and configs for giving LDAP the proper access. At least I THINK that is my issue.

We are trying to install Zimbra Email and Collaboration server on our instance with CentOS 7. I usually have no issues installing this software. However I am confused as to two points.

1. Are there any other ports that need to be opened on my firewall:
Firewall
Application Protocol Port range
SSH TCP 22
HTTP TCP 80
Custom TCP 389
HTTPS TCP 443
Custom TCP 7071

2. I am assuming that my /etc/hosts needs to be configed with the public IP and host name.
What is confusing is that I am seeing the private IP in my .etc/resolv.conf

When I attempt setup of the mail server software I get:
"Unable to create a successful TLS connection to the ldap masters."

[king0770]

https://wiki.zimbra.com/wiki/Ports

[zimico]

Hi,
Lightsail VPS uses 1 public IP and 1 private IP. You need to set up split domain configuration by installing your own DNS server (dnsmasq for example). You can refer to the following guide to change the dns name server in Lightsail VPS: https://aws.amazon.com/premiumsupport/k ... tu-debian/

Regards,