OSD Permissions Denied when using OSD Check Plugins with Nagios 4.3.4 / NPRE 3.2.1

When attempting to check OSD with Nagios using NRPE, I am getting the following error:
OSD ERROR: 2018-01-10 14:18:26.252441 7f67360c7700 -1 asok(0x7f6730001680) AdminSocketConfigObs::init: failed: AdminSocket::bind_and_listen: failed to bind the UNIX domain socket to '/var/run/ceph/ceph-client.nagios.1784273.140081163671472.asok': (13) Permission denied .

I have followed the documentation where we create the keyring file for nagios:
ceph auth get-or-create client.nagios mon 'allow r' > /etc/ceph/client.nagios.keyring

thank you

Karl Birkland