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My opnsense lan is 10.10.10.1

I forgot to mention that I already turned it off, but it still doesn't work :(

and thanks for your quick reply 😀

Hello everyone,

I'm fairly new to OPNsense, so please bear with me if I'm missing something obvious. I'm experiencing an issue with Stateful Packet Inspection (SPI) that I don't quite understand. As far as I know, SPI should automatically allow return traffic for outbound connections, but in my case, it doesn't seem to be working.

My Setup:
ISP Router: 192.168.1.1
OPNsense WAN: 192.168.1.10 (placed in ISP router's DMZ)
OPNsense handles all internal routing and firewall rules.
The Issue:
Outbound connections work only if I have both an "Allow Any Any" Outbound Rule and an "Allow Any Any" Inbound Rule on the interface.
If I remove the inbound rule, all traffic stops, even though SPI should allow return traffic for established connections.
This happens on all interfaces, not just a specific one.
However, OPNsense itself can reach the internet (e.g., downloading plugins works).
What I've Tried:
Checked Firewall Optimization Settings: Set to "Normal."
Firewall Logs: Traffic gets blocked when the inbound rule is removed.
NAT Settings: Outbound NAT is set to Automatic.
Gateway Configuration: WAN gateway is correctly assigned.
Tested on Different Interfaces: Same issue everywhere.
I expected SPI to handle return traffic without requiring an explicit inbound rule. Since I'm still new to OPNsense, I might be overlooking something basic. Any help or guidance would be greatly appreciated!

Thanks in advance!