USG FLEX 500 - Internet with fixed IP does not work.

Hello, we are facing a problem with the USG FLEX 500, where we have an internet link with a fixed IP that does not work on this firewall. It is not possible to access the internet, not even to ping the internet link gateway. However, when testing this same link with the same fixed IP settings on any other device, the internet works perfectly.

We have already reset the USG FLEX 500, updated the firmware, downgraded the firmware, and tested with another network cable. Both the LAN and the firewall itself are without internet, since it is not possible to ping through the firewall CLI. We also tested configuring the MAC of the old firewall (USG60) on the WAN1 interface of the USG FLEX 500, but the problem persists.

We contacted the operator, and they informed us that there is no device or MAC blocking. They stated that, by configuring the IP, mask, and gateway correctly, the internet should work, which in fact occurs on any other device.

We tested using another firewall port, but the problem persists. We also performed a test using another internet link with DHCP, and this one works on the firewall.