Management Interface opening web login page that uses basic authentication

Started by niwmik, February 04, 2026, 06:07:01 PM

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I have set up a Management Interface and assigned it to the "Listen Interfaces" in System: Settings: Administration.  For testing purposes, I created a firewall rule for the Management Interface that passes to all destinations.  I created a ISC DHCPv4 services and am able to get an i.p. of 192.168.100.50.  I then try to open the web interface at 192.168.100.1, but instead of getting the form-based authentication page, I get a basic authentication prompt.

This has worked for me before in an older version of OPNsense, but I'm starting fresh with 26.1.  Is there something else I need to set up to get this to work?

I think what you see is probably an overlay of several misconfigurations. OpnSense does not have a basic authentication for starters.

Maybe what you see is the basic login of your ONT or modem, which often has a management IP of 192.168.100.1. For this very reason, the use of that specific subnet is discouraged here.

That being said, you should not have the ONT on your management network, because it much likely also is your WAN.
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