DNS issue in Java - Need help

[Arunkumar]

hi 
 We are having our network built on DNS server.let us assume DNS entry
for one of the PC is removed where the application (server) is
running.Im trying to connect the client from another PC(windows) by
giving ip address(say http://192.x.y.z:9090),the client hangs and the
process is very very slow.I want to know whether "providing the DNS
entry of the server PC (where application is running) in DNS server"
is the only possible solution??
 My application is based on Java.When the same kind of application
built in C is connected i dont see any issue connecting from windows
PC.Is this a known issue in Java?? When i calculated the time taken
for the foll process,in windows it takes around 4 sec,but in linux it
takes around 40 ms only.
  "InetAddress.getByName(ipaddress)).getHostName()"
 Any help would be appreciated

Thanks & Regards
Arunkumar E.L.R
www.adventnet.com