I'm using a CentOS 6.8 VM as my LDAP server.  We are using phpldapadmin so we can configure our LDAP settings through the GUI that is supposed to be accessible by going to an internet browser and connecting to https://filler-name/phpldapadmin.  I am sure that LDAP is functioning correctly because I'm able to log into the cluster using my account that was created by phpldapadmin but I cannot access the web GUI provided by phpldapadmin.  phpldapadmin was functioning for the past three years but has suddenly not worked for some reason.  I believe it to be something wrong with httpd but I am not sure what.  When we try connecting to the website's default page, we still get the timeout message.  We have tried service httpd restart to no avail.  I tried pausing iptables temporarily and connecting to the website to see if it was a firewall issue but that has not helped either.  I've also tried setting SELinux to permissive but still no luck.What could cause our webserver connection to timeout like this?  The browser definitely senses that a webserver is there but it shows me the message The connection has timed out. The server at <website-name> is taking too long to respond. 
What can possibly cause a website connection timeout when HTTPD service is running and iptables is off?
centos;apache httpd;ldap