I am trying to install hadoop (manual installation) on linux (RHEL5.5) in a single host(Both for Datanode and namenode). After completing the installation I became able to start the namenode, secondarynamenode and datanode. I have configured the file (core-site.xml,hdfs-site.xml,mapred-site.xml,taskcontroller.cfg) and placed them in the proper location. I have edited the host name and placed the hostname into the configuration file too. But when I am trying to run the smoke test by typing http://myhostname:50070 in the browser , it replies failed to connect everytimes. Please help me to sort the problem as early as possible.