`{"error":"Unauthorized"}` when click on Matterbridge diagnostic log

[lboue]

Describe the bug

Version: 3.5.2

To Reproduce
Steps to reproduce the behavior:

1. Go to '...' menu
2. Click on 'Download'
3. Click on 'Matterbridge diagnostic log'
4. See error

{"error":"Unauthorized"} when
Expected behavior

This should download the log file.

Screenshots

Error

Debug file
Please always add the debug file to help explain your problem.
How to download the log

Plugin (please complete the following information):

N/A

Matterbridge (please complete the following information):

• Version: 3.5.2
• OS: Home Assistant add-on
• Setup used: Home Assistant add-on

Additional context

[Luligu]

Try to update the add-on
Cause here I don't see it... but I pushed now 2026.1.3 and can be related.

[lboue]

Same issue using Matterbridge Home Assistant Application 2026.1.3:

[lboue]

Same issue running Version: 3.5.2 in my Linux VM:

Logs

[20:58:05.582] [Frontend] WebSocket client disconnected
[20:58:05.582] [Frontend] All WebSocket clients disconnected. WebSocketServer logger global callback removed
[20:58:05.587] [Frontend] The frontend sent /api/download-diagnostic
[20:58:05.588] [Frontend] Warning blocked unauthorized access request /api/download-diagnostic from ::ffff:192.168.1.***
[20:58:05.612] [Frontend] WebSocket upgrade success host 192.168.1.***:8283 password (empty)
[20:58:05.613] [Frontend] WebSocketServer logger global callback set to debug

[Luligu]

Still have this ?

[Luligu]

?

[lboue]

Yes still the same issue with v.3.5.2 and addon version: 2026.2.1

[lboue]

I will test it with 3.5.3 version.

[lboue]

I am still having this issue using 2026.2.2 add-on and matterbridge to 3.5.3
I have the same problem with two matterbridge instances running latest version of the add-on running in HAOS.

[Luligu]

[20:58:05.582] [Frontend] WebSocket client disconnected
[20:58:05.582] [Frontend] All WebSocket clients disconnected. WebSocketServer logger global callback removed
[20:58:05.587] [Frontend] The frontend sent /api/download-diagnostic
[20:58:05.588] [Frontend] Warning blocked unauthorized access request /api/download-diagnostic from ::ffff:192.168.1.***
[20:58:05.612] [Frontend] WebSocket upgrade success host 192.168.1.***:8283 password (empty)
[20:58:05.613] [Frontend] WebSocketServer logger global callback set to debug

You see something is not correct here.
Your frontend is not connected when you first try the command.
I don't understand if it is a browser issue or whatever.
If you refresh the page the frontend connects and then download.
At least that way should work.
btw I cannot repro here even on the Hass Green device nor on any container.

[lboue]

It's happening again

[Luligu]

Ok,
I need a log with more data before and after please.

Need to understand what happens before in your setup.
Here I cannot repro.