I am using Shortpixel cloud image optimizer, but the plugin could not work properly for some restrictions

I am using Shortpixel cloud image optimizer, but the plugin could not work properly for some restrictions.
I need to allow “api.shortpixel.com” access on HTTP (port 80) or HTTPS (port 443). Could anybody help me to do that?

I had to add the below to Firewall -> Tools: IP Access Rules

I have also add the IP Access rules to firewall, but problem not solved;