Home assistant with Cloudflare tunnel not functional after updating

Configuration Frontend
1

For some reason after upgrading home assistant to version 2025.12.4 and 2025.12.5 my server hangs when accessing it through my external cloudflare tunnel URL. The local IP version works though.

I reverted back to my last save 2025.5.2 and upgraded again but the same thing keeps happening.

I deleted all cache, tried incognito but this issue stays
Does anyone have a solution?

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2

I use an external Cloudflare URL and have no issues with 2025.12.5

Home Assistant OS

  • Core 2025.12.5
  • Supervisor 2025.12.3
  • Operating System 16.3
  • Frontend 20251203.3

Check your logs to start

3

Thank you, the logbook only says:

2026-01-01 14:17:25.985 WARNING (MainThread) [homeassistant.components.http.ban] Login attempt or request with invalid authentication from host-ozwgmbqt2lcvrx70.pd.mod-w2d1-a.v6.dfn.nl (2001:4c3c:a001:ba00:2546:e65b:acde:c938). Requested URL: ‘/auth/token’. (Home Assistant/2025.12.1 (io.robbie.HomeAssistant; build:2025.1546; iOS 26.2.0) Alamofire/5.8.0)

2026-01-01 14:17:26.172 WARNING (MainThread) [homeassistant.components.http.ban] Login attempt or request with invalid authentication from host-ozwgmbqt2lcvrx70.pd.mod-w2d1-a.v6.dfn.nl (2001:4c3c:a001:ba00:2546:e65b:acde:c938). Requested URL: ‘/auth/token’. (Home Assistant/2025.12.1 (io.robbie.HomeAssistant; build:2025.1546; iOS 26.2.0) Alamofire/5.8.0)

2026-01-01 14:17:26.364 WARNING (MainThread) [homeassistant.components.http.ban] Login attempt or request with invalid authentication from host-ozwgmbqt2lcvrx70.pd.mod-w2d1-a.v6.dfn.nl (2001:4c3c:a001:ba00:2546:e65b:acde:c938). Requested URL: ‘/auth/token’. (Home Assistant/2025.12.1 (io.robbie.HomeAssistant; build:2025.1546; iOS 26.2.0) Alamofire/5.8.0)

2026-01-01 14:17:26.540 WARNING (MainThread) [homeassistant.components.http.ban] Login attempt or request with invalid authentication from host-ozwgmbqt2lcvrx70.pd.mod-w2d1-a.v6.dfn.nl (2001:4c3c:a001:ba00:2546:e65b:acde:c938). Requested URL: ‘/auth/token’. (Home Assistant/2025.12.1 (io.robbie.HomeAssistant; build:2025.1546; iOS 26.2.0) Alamofire/5.8.0)

When I try to access it via the iOS app.

4

Finally fixed it by creating a new tunnel on another cloudflare account…