Home Assistant 2026.9.0 – “Could not load Home Assistant” after update

Installation
1

After updating to Home Assistant 2026.9.0, I started experiencing a connection issue both in the Companion App and when accessing Home Assistant through a web browser.

I repeatedly got the following message:

Could not load Home Assistant. Please refresh the page, and clear your browser cache if the problem persists.
Unable to connect to Home Assistant.
Retrying in XX seconds…

I tried several troubleshooting steps, including clearing the browser cache and browsing data, clearing the Companion App data, and completely uninstalling and reinstalling the Companion App. However, the problem persisted.

Sometimes I was able to reach the Home Assistant login page, but after logging in, the same error would appear again. After refreshing the page several times, I could occasionally get into Home Assistant, but the issue would return.

The only solution that worked was restoring a backup from Home Assistant 2026.8.3. After restoring the 2026.8.3 backup, the problem disappeared completely, both in the Companion App and in the web browser.

2

See Constant reboot after 2026.9 update - #36 by MichaelMKKelly

3

Same problem here.

4

I restored to 26.8.3 also and all was ok for 15 hours ..but last few hours counters are counting up for no reason .. l have now restored again and losing time .. no sign of patch update for 26.9?

5

Based on a post on Github, I’ve commented out the following 2 lines in my configuration.yaml file and this allows me to log in on both Windows (Chrome) and Android.

extra_module_url:
- /config/www/community/lovelace-card-mod/card-mod.js

This is a VERY temporary fix

6

Hi, same issue with the same message here, but after a few seconds I can access to Home Assistant.
When I access home assistant, it seems slower than usual and some icons doesn’t load every time.
I’m running HAOS Baremetal on Raspberry Pi 5 4GB

Edit : This solved the issue for me

7

I’ve now rolled back to 2026.8.3. I’m running HAOS in a Proxmox VM. In addition to the other 2026.9.0 issues, when I access HA via a custom domain (using a Cloudflared tunnel), I receive the “Error while loading page integrations” message when I try to access Settings - Devices & services. This doesn’t happen with I access HA via IP address on my LAN.

What a Hot Mess.

8

Same here :grimacing:

9

Same here. The first time I open the companion app, it shows this error page in the browser. If I open the app again immediately afterward, it works fine.

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10

Save issue here.

11

Removing extra_module_url fixed it for me.

12

Remarking the line with
card-mod.js
in configuration.yaml under
extra_module_url
fixed it for me too

13

9.1 is available. Trying that now.

14

9.1 seems to have fixed it for me

15

Yes, fixed with latest update.

16

Has 26.9.1 addressed the issues with 26.9.0 does anyone know

17

2026.9.1 seems to have fixed the issue. A thousand thanks :wink:

18

2026.9.1 is still broken for me. Had to roll back

19

Solution a tested
Settings→System→Network`

  1. In the “Reverse proxy” section:
    • Enable “Trust X-Forwarded-For”
    • Add 192.168.x.x/32 to the “Trusted proxies” list Adress the Box
    • Also add 192.168.x.0/24 to cover your entire local network