Shell script to stop start regionserver not working

[Ninad Raut]

Hi,
I am trying to stop start region server remotely but I am getting a error
log saying "connection to node1/192.168.0.1:44444 from an unknown user:
closed"
ssh ith...@node1 '/home/ithurs/hadoop-0.19.0/bin/hadoop-daemon.sh start
regionserver'
Please let know where am I gng wrong.
Ninad.