httpd not really listening on Wombat -- lockup?

 I'm not sure if I missed some critical package while upgrading from Ansel 
to Wombat, but I've got a pretty puzzling problem.
 According to the system itself, httpd is listening on ports 80 & 443.  
`netstat -lp` seems to confirm this:

tcp        0      0 *:http                  *:*                     LISTEN      
1203/httpd                                                                      
tcp        0      0 *:ssh                   *:*                     LISTEN      
723/sshd                                                                        
tcp        0      0 *:https                 *:*                     LISTEN      
1203/httpd

 Okay, fair enough.  However, `nmap` from a remote host disagrees:

PORT    STATE  SERVICE
22/tcp  open   ssh
80/tcp  closed http
443/tcp closed https

 The obvious suspect, iptables, isn't even loaded.  To make this even more 
fun, if I try portscanning the local host (using either 127.0.0.1 or the 
real IP), the machine locks up.
 Suggestions?  Ideas?  Requests for command output?
 Thanks in advance.

     Jima

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