Apache Httpd - Access error

[Rodrigo G. Tavares de Souza]

Hi,

    I'm getting a strange error when I try a direct access to a folder 
in the server.
    If I simple type the machine address in the browser, it works
    Ex: http://200.153.0.100 [it works]
    But, if I type the address with the folder/file name, it doesn't 
work. The address is
translated to the machine name, getting an error, because the isn't a 
DNS to this address.
    I saw the httpd.conf, but there is no reference to machine name or 
domain.

    Ex: http://200.153.0.100/folder [automatic translated to] 
http://machine.domain.com/folder [it doesn't work]

   It also happen in the local network.

   What do I suppose to do?

Best Regards,
Rodrigo Souza
Sao Paulo - Brazil