After a recent update to QuFirewall, the app will not retain the selected profile (restricted security) and reverts to the basic protection profile, which makes the NAS inaccessible. Manually restoring the profile to restricted security corrects the problem temporarily, but the profile selection later reverts to basic protection. (I long ago added a few additional rules to the restricted security profile necessary to make the NAS accessible in my network and this has worked without issues until the most recent QuFirewall update.) Disabling QuFirewall completely also solves the connectivity problem.
TS-451+ running latest QTS version
Summary: All works as intended when QuFirewall restricted security profile is enabled. QuFirewall profile reverts to basic protection for unknown reasons when NAS is rebooted or shutdown and restarted. This prevents my “cold storage” security strategy from working; cold storage powers down the NAS when not actually performing a backup, and starts the NAS when needed for a BU. Prior to the recent QuFirewall update the selected QuFirewall profile was preserved through reboot or power cycle.