pfSense

After the installation, unbound works 'out of the box'.

When a previously saved config.xml is imported
and pfBlockerNG-devel was previously installed
and pfBlockerNG-devel was using the 'python' mode
then this part is added to unbound.conf

# Python Module
python:
python-script: pfb_unbound.py

The issue : this part is added without checking if /var/unbound/pfb_unbound.py actually exists.

Its possible that, after the "import.xml", pfBlockerNG-devel isn't installed yet, or not finished to install.

Solution (?) : before adding 'python' part (see above), the a file_exist() should be used to check if that file really exists.
( and if it doesn't (yet), a reminder should be logged / returned to the GUI that the unbound should be restarted later on, as python mode was asked for, but not available yet ? )

Unbound is restart with a failing config - /var/unbound/pfb_unbound.p is missing, and stops.

See also this forum thread :
'Catch 22' with fresh install, pfBlockerNG 3.0.0.16 and Python enabled