I've been tasked with figuring out why a redhat 6.4 server w/openldap v2.4.23 is not accessible.
This server is a test server. I have a production server that is working properly, and I've gone thru and compared config files, etc, but haven't found any differences. 

 I'm a newbie with this, so my understanding is still somewhat limited.  Here's what I've done or checked so far:

- iptables is not running
- if I run netstat, I can see port 389/port 636 in listening state:

tcp        0      0       *                   LISTEN      5603/slapd
tcp        0      0       *                   LISTEN      5603/slapd
tcp        0      0 :::636                      :::*                        LISTEN      5603/slapd
tcp        0      0 :::389                      :::*                        LISTEN      5603/slapd

I can telnet to port 389 on this server from another server, but not to port 636 - putty will throw back an immediate 'connection closed by remote host' message.

I'm not seeing any slapd related messages in /var/log/messages.

What else can I check on here?