Pi-hole: Cannot open WebUI using FQHN

[cmonty14]

In raising this issue, I confirm the following: {please fill the checkboxes, e.g: [X]}

• [x] I have read and understood the contributors guide.
• [x] The issue I am reporting can be replicated.
• [x] The issue I am reporting isn't a duplicate (see FAQs, closed issues, and open issues).

How familiar are you with the the source code relevant to this issue?:

1

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Expected behaviour:

I want to open WebUI using FQHN.
Please check this screenshot for details.

Actual behaviour:

When opening WebUI using FQHN I get this error: Access to the following website has been denied.

Steps to reproduce:

Use FQHN to access WebUI.

Debug token provided by uploading pihole -d log:

9v4rv6ejzq

Troubleshooting undertaken, and/or other relevant information:

-

Opening WebUI using server's IP works w/o issues.

[Mcat12]

The web interface only allows access via pi.hole, localhost, 127.0.0.1, and the IP address. If you want to access it from another domain, you will have to add this to /etc/lighttpd/external.conf:

setenv.add-environment = (  
          "VIRTUAL_HOST" => "your.fqdn.here"
)

[ghost]

If you add "/admin" to your FQDN, it should work:
ct-101-pihole.[...].lan/admin

[cmonty14]

Solution of @stitch10925 is working perfectly for me.
Therefore I won't modify the Lighttpd config.

THX