Hello mtariqgyahoo,
For some reason nxnode process is crashing on your Linux system. Consecutive failed attempts of restarting it, lead to generation of huge number of leftover files in /usr/NX/var/db/failed directory.
It’s possible to remove them by running in terminal:
sudo /etc/NX/nxserver –history clear
To prevent creation of the next files you can temporarily disable nxserver by running:
sudo /usr/NX/bin/nxserver –shutdown
Next, we should try to understand why nxnode process is not working correctly. Gather server-side logs from your linux machine according to these instructions:
https://www.nomachine.com/DT07M00098#1
Gather, if possible, backtrace of crashing nxnode according to:
https://www.nomachine.com/AR09L00810
Send backtrace and logs to forum[at]nomachine[dot]com.