ssh unterbricht while Schleife

#! /bin/bash
#########################################
#       /srv/scrips/recurse-wks         #
#                                       #
# Execute commands as root on all       #
# remote workstations in the            #
# ./.wks.list                           #
#                                       #
# (C) 2011 by Richard Neumann           #
# under the terms of the GPL            #
#########################################

WKSLIST=`dirname $0`/.wks.list
LOGFILE=/var/log/`basename $0`.log
USAGE="\
Usage: `basename $0` [commands]"

if [ $EUID -ne 0 ]; then
        echo "***`basename $0`: You must be root to run this script!" 1>&2
        exit 1
fi

if [ $# -lt 1 ]; then
        echo $USAGE
        exit 1
fi

while read WKS; do
        echo "Executing \"$@\" on \"$WKS\"." | tee $LOGFILE
        ssh $WKS "$@" 
done < $WKSLIST

wks-1
wks-2
barrechner

[root@weinheim lsa]# /srv/scripts/recurse-wks echo foo
Executing "echo foo" on "wks-1".
ssh: connect to host wks-1 port 22: No route to host
Executing "echo foo" on "wks-2".
foo
[root@weinheim lsa]#

[root@weinheim scripts]# ./recurse-wks echo FOO
Executing "echo FOO" on "wks-1".
Executing "echo FOO" on "wks-2".
Executing "echo FOO" on "barrechner".
[root@weinheim scripts]#

ssh -n