Admin page error

Help
1

1. The problem I’m having:

When I browse to the admin page I get an error. I’m on the server machine. The way I read the log, there should be no issue accessing the admin endpoint:
2026/06/13 17:45:17.731 ← [34mINFO<-[0m admin admin endpoint started {“address”: “localhost:2019”, “enforce_origin”: false, “origins”: [“//[::1]:2019”, “``//127.0.0.1:2019``”, “``//localhost:2019``”]}

2. Error messages and/or full log output:

{"error":"client is not allowed to access from origin ''"}

2026/06/13 21:59:52.936 ←[31mERROR←[0m  admin.api       request error   {"error": "client attempted to make request by disabling same-origin policy using no-cors mode", "status_code": 400}

3. Caddy version:

2.11.4 AMD x64

4. How I installed and ran Caddy:

caddy run

a. System environment:

Windows 10 x64

b. Command:

http://localhost:2019/admin
or /config
or /debug

c. Service/unit/compose file:

PASTE OVER THIS HERE IN THIS CODE BLOCK.
Please ensure it looks nice.

d. My complete Caddy config:

sub.anythingyoulike.com:8443 {
	reverse_proxy :81
}

5. Links to relevant resources:

Type here

2

You’re not saying how you’re browsing the admin page but your client needs to set the origin http request header.

3

The error says why the request was rejected:

client attempted to make request by disabling same-origin policy using no-cors mode

So, make sure the client is not doing this :slight_smile:

4

I’m using my web browser, Edge on W10. How do I change how the browser is browsing to the page?

Man, I don’t understand this. It used to work. I’ve never had trouble using localhost before for anything.

I tried "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --user-data-dir=C:\msedge-dev-data\ --disable-web-security but still fails.

So what is Caddy doing by this?: “enforce_origin”: false

5

What is the request being made by Edge? Use the devtools to get a readout of what it’s actually doing.

6

It’s not specific to Edge, to be sure. Firefox does the same. Does this show the request info you are thinking of?

Fx Edge

image
image546×665 21.6 KB
image
image409×517 19.6 KB

If this is general browser behavior, then how does anyone see Caddy’s admin or config pages?

7

Let’s take a step back. What are you exactly trying to do?

8

Just trying to see the /admin or /config page after starting Caddy.

9

It’s an API endpoint, not a page browsable on the browser.

10

Sorry about that. I had a bookmark in my browser from a long time ago. I don’t remember what I saw back then, but it must have shown something useful.

Thanks.