Access Log Valve

[Sinkinson,Andrew [NCR]]

   Hi,
  I have enabled access logging by uncomment the Access Log Valve in the
server.xml file.  I have added the resolveHosts attribute and set it to
true.  I have also changed the pattern attribute to %h so that I can
just get the  Remote host name in the log file.  In the access log file
I only get an ip address per request.  Any ideas on why I am not able to
resolve host names?
Thanks,
Andrew