Web GUI only works on some devices when accessing from OPT1

[spendec]

I'm new to OPNsense, and currently looking at adding it to my network in transparent bridge mode. I've got it installed on an N150 box with quad 2.5G Intel NICs.

I've been following a YouTube guide that includes setting up a dedicated management interface on OPT1 and I'm getting some weird behaviour I was hoping to get some advice on troubleshooting (WebGUI works fine via LAN, its the OPT1 access I'm struggling with).

- Static IP is configured on OPT1 in the range of the rest of my home network (192.168.0.2) and interface is connected to a port on the same switch that the rest of the devices are using. Router is an ASUS TUF-AX3000.

- Firewall rule setup per the YouTube guide to allow HTTPS access via OPT1, and listen on all interfaces is set in the general config for the Web GUI.

- Weird behaviour - only some devices on my network can access the Web GUI via OPT1 - my mobile (via chrome browser, on the wifi), and for testing I also tried the Firefox container on my Unraid server (hardwired) and this also worked fine. However, my two laptops (whether on wifi or hardwired) just get a connection refused error regardless of the browser I try. They can both ping the OPT1 IP successfully though via cmd.

- I don't think it's the firewall - I get the same behaviour if I disable the firewall via the console.

- Both laptops can access the Web GUI if connected directly to the LAN interface via that IP (192.168.2.1), it just seems to be when they're put back on the main network and try to access via OPT1.

Any pointers on what I could try would be appreciated as I'm not quite sure where to go next. Both laptops get their IPs via DHCP from the Asus router, but so do the other devices that do seem to be able to access. I don't know if OPNsense has anything I can reset/clear that might be confusing things.

Thank you in advance!

[EricPerl]

Which guide did you follow?
Where did you insert the bridge? Between modem and router? Between router and switch?