MAUI: Cannot send request to server ...... (server may not be running)

ERROR: cannot send request to server ................42559 (server may not be running)
ERROR: cannot request service (status)

A few assumptions for this blog entry. You are using Torque and MAUI only for the resource manager and scheduler respectively.

Several things to check.
  1. Make sure your /etc/hostname reflect the correct entries for all the head and compute nodes
  2. For the Torque configuration, do follow the configuration seen in the blog entry Setting up Torque Server on xCAT 2.x. Pay particular attendtion to Step 2 and 3
  3. For the MAUI configuration, do follow the configuration seen in the blog entry MAUI Installation in xCAT 2.x
  4. Check the logs for MAUI at /usr/local/maui/log
After following Pointer 1-4, you are still unable to solve, you can get some hints if you can go to 
# cd /opt/maui/sbin/
and type 
./maui
In my particular situation, I encounter server must be started on host 'xxx.xxx.xxx.xxx.xxx' (currently on 'xxx') which is my short-name. I resolve it quickly by going to /usr/local/maui/maui.cfg and edit the 
SERVERHOST = xxxx
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