https://community.norton.com/t/steam-now-block-previously-not-blocked-nis-ver20-2-1-22/174162
Steam now block previously not blocked NIS ver20.2.1.22 - Norton Security | Norton Internet...
Feb 16, 2013 - FYI for Steam users upgrading to NIS ver20.2.1.22. Just upgreaded to NIS ver20.2.1.22 where the previous version had Steam updates unblock since the upgreade...