Log of traffic for a specific IP address, both of what the UTM blocks, as well as traffic to the Internet, something like a sniffer, the previous thing to be able to verify which page or url or port is blocking, every time I have inconveniences with pages that appear blocked but I do not know why they are blocked.
· How to make a static route to change the address of the UTM, try it but I can lose management on it.
· How to access via the web from anywhere to the UTM through a vpn.
If the https filter is active and the https page doesn't load, it means that the domain is blocked because of the https block. If it's a http page, the browser should show an error page with the reason why the page was blocked: a bad category (e.g. sex), or a blacklisted page etc. The full log of http access can be seen at menu Stats & Logs > Web Filter Logs > Full Visit Log. The Summary or User Usage summary in the same menu will show a statistics for the whole filter or for a single user.
To change the IP address of the UM it's not necessary to create a static routing. The static routing can be used to forward traffic to port B (the LAN behind the UTM). By default all the traffic that reaches the UTM and is going to an IP in the same network is already routed to port B, so it's not necessary to create a static routing for that.
If you change the IP address of the UTM, you may lose the connection. So it's better to connect to the UTM through port B with a pc that is in the same LAN segment, and from there change the IP.
To connect to the UTM from the internet, it's not necessary to set up a VPN, it's enough to edit the settings in your master router, the one that you use as gateway to the internet. There, you must route all the traffic that reaches port 443 of your public IP to port 443 of the IP address of the UTM, and do the same with port 80. If those ports are already routed to another IP on your router, you may choose another port number. So, for example if you route port 8443 of your public IP to port 443 of the UTM, then you can login from the internet with https://<your public ip>:8443
In any case, if you want to set up a VPN, the IP address of the UTM must be visible from the Internet, so the steps above bust be done.