Any special permission ssh remote command working on fifo file(aka named pipe)?

I need to redirect some strings to a fifo file with ssh remote command, but always got permission denied, the command I executed is:

ssh rundeck@nagios1 sudo su - root -c 'printf "Disable_Notification;web01;App:Tomcat:Log:webapp" >> /opt/nagios/nagios.cmd'

Then got this error:

bash: /opt/nagios/nagios.cmd Permission denied

The file permisson of nagios.cmd is:

prw-rw---- 1 nagios nagios 0 Mar  16 10:32 /opt/nagios/nagios.cmd

However I can successfully execute this command while I logged in to nagios1 as rundeck user with sudo command:

sudo su - root -c 'printf "Disable_Notification;web01;App:Tomcat:Log:webapp" >> /opt/nagios/nagios.cmd'

The nagios1 is running RHEL5, SELinus is set to Permissive. I don't see any log output(message and secure) while execute the command remotely.