Resolution for ERROR: cannot set TORQUE admins

Run the ./torque.setup root 

# ./torque.setup root
initializing TORQUE (admin: root@headnode.com)

You have selected to start pbs_server in create mode.
If the server database exists it will be overwritten.
do you wish to continue y/(n)?y
root     22809     1  0 11:57 ?        00:00:00 pbs_server -t create
Max open servers: 9
qmgr obj= svr=default: Bad ACL entry in host list MSG=First bad host: headnode.com
ERROR: cannot set TORQUE admins

Step 1: Configure the trqauthd daemon to start automatically at system boot for the PBS Server.
At $TORQUE_HOME

# cd $TORQUE_HOME
# cp contrib/init.d/trqauthd /etc/init.d/
# chkconfig --add trqauthd
# echo /usr/local/lib > /etc/ld.so.conf.d/torque.conf
# ldconfig
# service trqauthd start

Try the ./torque.setup root again. If there  is error like the above.

Step 2: Look at your host file. Make sure hostname of the server is the same as the first name with the corresponding IP Addresses

For example at /etc/hosts

# 192.168.1.1 headnode.com headnode
..... 
.....

At /etc/sysconfig/network

HOSTNAME=headnode.com
.....
.....

Step 3: Try the ./torque.setup root again.It should be successful

 ./torque.setup root
initializing TORQUE (admin: root@headnode.com)

You have selected to start pbs_server in create mode.
If the server database exists it will be overwritten.
do you wish to continue y/(n)?y
root     22843     1  0 12:00 ?        00:00:00 pbs_server -t create
Max open servers: 9
Max open servers: 9