IP ranges in firewall settings not possible to allow

Hello everybody,
I have to whitelist the IPs of Paypal for the IPN (Instant Payment Notifications), so I enter in the FIREWALL tab and select the TOOLS section; here I try to allow the following IP ranges of Paypal:
64.4.240.0/21
64.4.248.0/22
66.211.168.0/22
173.0.80.0/20
91.243.72.0/23

When I try to allow each IP range I get a message saying “Only an IPv4 range (CIDR) value of /16 or /24 is allowed for IP Access Rules”, so I am not able to allow any of them.
Does anyone know how I can solve the problem?
Thanks a lot in advance
Emanuele

This looks quite familiar.

And here’s more:

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Thanks a lot for the tip, I created a firewall rule and it worked :slight_smile:

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