From my diagnosis is there is a missing file on the site? I went to "http://pkg.pfsense.org/pfSense_v2_3_0_amd64-pfSense_v2_3_0/All/" and there is no pkg-1.7.2_2.txz just pkg-1.6.2.txz but not sure why the meta, packagesite txz's aren't working, i can browse to the directory and see them…

>>> Installing pfSense-pkg-darkstat... 
Updating pfSense-core repository catalogue...
pkg: http://pkg.pfsense.org/pfSense_v2_3_0_amd64-core/meta.txz: Connection reset by peer
repository pfSense-core has no meta file, using default settings
pkg: http://pkg.pfsense.org/pfSense_v2_3_0_amd64-core/packagesite.txz: Connection reset by peer
Unable to update repository pfSense-core
Updating pfSense repository catalogue...
pkg: http://pkg.pfsense.org/pfSense_v2_3_0_amd64-pfSense_v2_3_0/meta.txz: Connection reset by peer
repository pfSense has no meta file, using default settings
pkg: http://pkg.pfsense.org/pfSense_v2_3_0_amd64-pfSense_v2_3_0/packagesite.txz: Connection reset by peer
Unable to update repository pfSense
All repositories are up-to-date.
New version of pkg detected; it needs to be installed first.
The following 1 package(s) will be affected (of 0 checked):

Installed packages to be UPGRADED:
	pkg: 1.6.2 -> 1.7.2_2 [pfSense]

The process will require 91 KiB more space.
2 MiB to be downloaded.
pkg: http://pkg.pfsense.org/pfSense_v2_3_0_amd64-pfSense_v2_3_0/All/pkg-1.7.2_2.txz: Connection reset by peer
Failed