UTM blocking many but not all https

When using "Web Protection" you do not use a firewall rule to allow https traffic from the internal devices to the internet. Instead, traffic flows from internal net to the firewall proxy. The proxy running ON THE FIREWALL starts a new process to "talk" to the internet on behalf of the internal device. So when using "web protection" there is an implicit rule to allow traffic from the firewall to the internet. And that's it. All other "blocks" you are seeing is traffic from other sources than your browser, but this is a little guess work here, since you do not further specify. Normally, this depends on how you setup the proxy: in "transparent mode" it intercepts every tcp port  80 and 443 taffic and tries to "jump in between".

Copy here a line or two from the Firewall log where 443 is blocked from the device.  In 'Web Filtering', on the 'HTTPS' tab, is 'Decrypt and scan' selected, or ??? Also, confirm that there's nothing related in the 'Transparent Mode Skiplists' on the 'Misc' tab.

Cheers - Bob

Hello SalishSwede,

Thank you for reaching out to the community, it would be great if you can share the screenshots of the policy created on the UTM and also which of the websites https are blocking and also help us with which category of the websites are blocking ?