@Manoj690
Are you sure that the NameNode is running on "localhost" (where you are opening the mentioned URL in the browser) ?
1. Can you specify the namenode IP Address/ Hostname in the URL instead of "localhost" ?
2. Can you also check if the NameNode is listening on port 50070 ? (is that port opened and firewall is disabled) on NameNode host?
# netstat -tnlpa | grep 50070
# service iptables stop
3. Please check if you are able to telnet NamerNode host=name & port from the machine where you are running the Browser?
# telnet $NAMENODE_HOST 50070
(OR)
# mc -v $NAMENODE_HOST 50070
4. Check and share the NameNode log. Usually it can be found inside the "
/var/log/hadoop/hdfs/hadoop-hdfs-namenode-xxxxxxxxxxxxxxxxxx.log
"