HTTP Bad Request 400 - apache on Fedora 8

[Bob Hartung]

Hi all,
   I get the above error when (all machines on same private network):
         I try to access the server from the remote client by ip 
address; e.g.  http://xxx.xxx.xx.xx.
         With an entry into the client host file I can access the server 
with http://rwheserv1 without any problem.

   On the server, I can http://localhost okay but cannot http://127.0.0.1

   I changed httpd.conf to include:
     NameServer xxx.xxx.xx.xx
     UseCanonicalName On

   All firewalls have been turned off.

   The result is the same.  It is pretty obvious I am missing one point 
but darned if I can find the directive that I have failed to set.

Any suggestions appreciated.

Bob