Main UI loses connection to openHAB

Setup, Configuration and Use Runtime
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1

using openHAB 4.1.0 Release Build on openHABian v1.8b.

I experience the following behaviour with openHAB4 since a few releases, but now it feels more rapidly that this happens:

What I do:

  1. open openHAB in a new browser-session
  2. I’m logged in via Cookie
  3. I use the MainUI
  4. I open multiple TABs (items, rules, things,…)
  5. after some time MainUI loses the connection to openHAB
    5.1 rules won’t get saved anymore
    5.2 items dont’ get loaded/…
    5.3 things don’t get loaded
    5.4 pages won’t update
    5.5 bindings can’t be searched/…
  6. restarting the browser fixes this => started with (1)

If I open /profile, there’s a bunch of sessions, but only one for each client with either IP or FDQN on my openHAB-Server.

The error is regardles the browser, it happens in Firefox, Chrome and Edge (Chromium) the same.

2

Are you using HTTP or HTTPS? I remember seeing an issue or maybe a PR go by that talked about the SSE event stream isn’t always working right with HTTP. Could be related, could be completely unrelated.

3

It’s http for me.
and I remembered the F12-console for “network analysis”.

What appears to be the problem is MainUI losing authorization, as the XMLHttpRequest (e.g. /rest/items?metadata=semantics) throw an 401 if that happens. Funnily enough, if I use the F12-console, it seems(?) to be “self-repairing”, as after an 401 i can more often seem to call through in other MainUI categories…? The previous 401 changes to a 200 after a click again…

4

In programming we jokingly call that a Heisenbug.. It might be worth an issue but I don’t know if there is enough information here yet to reproduce and diagnose the problem.

5

i can always reproduce this with the numbererd steps in the initial post. If noone else can, then it’s my environment! :wink:

6

I can somewhat confirm this error. UI feels sluggish, and randomly it takes like 20s to refresh pages. Also, when needed to pick something from a list (f.e. pick mqtt broker when adding a mqtt thing, or selecting a thing to create equpiment from). Also can confirm that the issue goes away immediately when I use https access instead of http.

EDIT: ok just as I wrote this, the issue returned on https as well. Confused to say the least.

I’m using fresh install, dockerized latest official image.

7

To add to it, I’ve watched the F12 console and requests to /events endpoint amass very long wait times.

https://carter.os:8443/rest/events?topics=openhab/items/*/added,openhab/items/*/updated,openhab/items/*/removed

shows over 5 mins now, and the message “Warning, this request has not been finished yet”. It has a 200 OK status.

8

Another update.

I tried Edge. And to my surprise, it’s day and night. Yes, every now and then the issue appears, but all I need is to open the UI in new tab every 30 mins or so and it works. While in chrome it was unusable.

Weird issue.