From IRC:

rcn (IRC)
since upgrading from foreman 1.15 to 1.16 the Puppet ENC is broken for me
the nodes.rb script returns yaml classification for only a couple of nodes (~10%)
for most of the nodes the script errors out with "Error retrieving node node.example.com: Net::HTTPPreconditionFailed"
the foreman log file /var/log/foreman/production.log shows the following output: https://gist.github.com/bitcrush/ad232e2f680429a4d9f75c46b96acb78