Errors occured attempting to create or configure the dpi (by configuing the file: /etc/dpi/fastdpi.conf) may cause the dpi fails to start, so it is highly recommended to back up the original configuration file (/etc/dpi/fastdpi.conf), edit this backup file, check it using diagnostic command, and only after that to replace the original file with newly created one and to restart dpi.

Example of recommended actions:

#create backup file
cp /etc/dpi/fastdpi.conf /etc/dpi/fastdpi.conf.new
#edit backup file
vi /etc/dpi/fastdpi.conf.new
#integrity test 
fastdpi -p -c /etc/dpi/fastdpi.conf.new
#Result check configuration : SUCCESS means that configuration is valid
#replase the original configuration file by newly created one
cp /etc/dpi/fastdpi.conf.new /etc/dpi/fastdpi.conf
#restart dpi
service fastdpi restart