Why doesn httpd show up in my list of services?
Apache by default on most platforms listens on an a socket that supports both IPv4 and IPv6. Net-SNMP doesn’t display IPv6 sockets in its TCP table. As a result we don’t get it during an SNMP model of a device. This isn’t true for portscan or SSH modeling. To solve the problem you can force Apache to listen on an IPv4 socket only.