C6300: "Block services" does not function normally

Instead of using parental controls, I use "Block Services" to not allow a few devices to access internet during night 12:30am - 6am.

 

Firstly, I assigned those devices static IP addresses in the range of 192.168.0.51 ~ 192.168.0.100.

Secondly, in Advanced settings -> Security -> Block Services, I set up a service table: block all service types and all ports for this IP address range. (see attached the service table)

Thirdly, I set up a sechdule table 0:30 - 6:00am.

 

But after I enabled Block Services, a strange thing happened: some of other wired devices lost their connectivity to internet. For example, my Netgear Arlo Pro Camera Base (wired) lost its connectitivity; My two VoiP phones stopped working; no dial tone.

 

The symptoms occur once I enable Block Services regardless of when I do it. I tried in and out of the block time range 0:30 - 6:00am. Further, even if I disabled it after enabled Block Services, the symptoms would stay.

 

I rebooted all associated devices including C6300, but it did not help. I also tried to block specific sevice types: HTTP and HTTPS instead of all services, the same smptoms would occur.

 

All devices connected via Wi-Fi were not effected.

 

firmware V3.01.09