Hi Bart,
In this case, if you are facing issue like failt to get connection state from the device - Object not found ,
you need to check the status of the devSvr
/etc/init.d/devSvr status
Most probably u'll see deviceDirectiveHandler process in not ON.
after that u need to remove the large backup files from the /var directory i.e, creating enough space in /var directory
after that you need to reboot the NSM appliance.
hope this would solve your problem
Regards,
Dilmani