Can't access HA through Tailscale subnet router with iOS app while Safari and SSH are OK

osmeest · October 3, 2025, 2:20pm

Hi,
I’m trying to set up remote access to my HA using Tailscale. I have a client running on my GL.iNet router which is connected to Tailscale and allows access to LAN resources (acting as a subrouter). The LAN subnet is advertised and approved in the Tailscale admin. From my iPhone running Tailscale over 4G, I can access HA via Safari or via SSH but the iOS app refuses to connect. When the phone is on the wifi (with Tailscale stopped), it works of course.

What could it be?

Thanks in advance for your enlightening suggestions

pkscout · October 3, 2025, 6:56pm

You didn’t mention if you’re trying to use DNS names or IP addresses. I have all my bookmarks and mobile app setup using IP, so it works fine over Tailscale with a subnet router setup. If you’re using names, I don’t think those will work without some more work on the Tailscale side.

JeeCee · October 4, 2025, 1:04pm

@pkscout I’m also struggling with TS.
Have you also set-up HTTPS?

osmeest · October 13, 2025, 11:42am

I’m using IP addresses from the LAN. Since Tailscale is configured with access to LAN devices and the route to LAN addresses being advertised and approved, I would expect the app to be able to connect.
I’m using HTTP to access HA to avoid connection problems.
I had set up a port forwarding on my router, with my Synology NAS proxying the external HTTPS to local HTTP. That worked with the NAS set as trusted proxy.
I have also tried with the router (Tailscale sub router) in the trusted proxies, both its local address and its Tailscale IP but that didn’t help (quite understandably since there is no real proxying but rather routing).
Also, accessing via SSH and HTTP works, it is a companion app issue only.
I didn’t check opening the web socket manually if that can be done on an iPhone.

osmeest · October 31, 2025, 1:22pm

For some reason, I had to disable network acceleration on the router. I hoped that maybe this would help but unfortunately not. I can access HomeAssistant through the HTTP server on port 8123 but the iPhone app refuses to connect.

Anyone has a suggestion for this ?

Gregwelldone · December 20, 2025, 12:11pm

Classic problem not resolved since months
To mention a few:

github.com/tailscale/tailscale

iOS: Connectivity is lost when the first configured DNS server goes down

opened 06:45PM - 13 Oct 25 UTC

FloatingMilkshake

OS-ios dns needs-triage bug

### What is the issue? If an iOS device is connected to your tailnet and config…ured to use two DNS servers that are nodes on the tailnet (with "Override DNS servers" enabled), taking down the first DNS server results in a loss of DNS resolution and a loss of connectivity to other tailnet nodes. Discussed in this thread in the Tailscale Community Discord server: https://discord.com/channels/1379528469859532931/1426218752701104321 ### Steps to reproduce 1. Set two nodes on your tailnet as DNS resolvers (what they run probably doesn't matter as long as they can serve DNS, but I am using two AdGuard Home instances, running on Ubuntu and Debian) 2. Make sure your iOS client is using them, its DNS (and network connectivity otherwise) should function fine—you can leave the Tailscale app open 3. Bring down the first listed DNS server with `tailscale down`, and wait at least a couple of minutes - you will notice the indicator next to the node you have just taken down change from gray to green in Tailscale on the iOS device 4. Go try to make a DNS query somewhere like Safari - you might have to guess a few times to find something that isn't cached (or it may help to use something like https://dnsleaktest.com); when you find something, Safari will get stuck "loading" as it tries and fails to make the DNS query, or if you are using dnsleaktest.com then the test will just get stuck and not progress 5. Return to Tailscale, you'll notice warnings for either DNS Unavailable or MagicSock Function Not Running, they seem to alternate - strangely, you may also notice a green indicator for the downed DNS server node, but this will likely change to gray again shortly 6. Try to ping some of your nodes—even the still-functional DNS server, or other known-online nodes, will fail to be pinged While the problem is occurring, the indicator for warnings may completely disappear, and you may see "No issues found"—it might seem like DNS resolution has started working again, but this will only last a second before the warnings return and DNS fails again. You will probably end up in an odd loop between failed DNS with warnings, and working DNS for just a second with no warnings. To recover, bring your downed DNS server back up with `tailscale up`, and wait a moment—DNS and network connectivity will return, and eventually the warnings will also disappear. Bug report: `BUG-536bdc65ec63b13b9060c4f109db547043b7050f4ffaa73444bf4ebc4a80fb21-20251013175411Z-1943a2a26d893815` While the problem is occurring, turning Tailscale off and back on fixes the issue for about 10 seconds, and then DNS and pings/connectivity are all still broken. However, I noticed that I could ping a single node that is shared with me (`msft.erisa.ts.net`, belonging to @Erisa), but not any of my own nodes or even a different node that someone else is sharing with me. Here is a bug report from when I tried turning Tailscale off & back on: `BUG-536bdc65ec63b13b9060c4f109db547043b7050f4ffaa73444bf4ebc4a80fb21-20251013180405Z-964dc328e3d5e671` Reproduced with an iPhone 16 running iOS 26.1 public beta 2(?), build `23B5059e`, & Tailscale version 1.89.185. At the time of testing, my iPhone was connected to cellular via 5G, though this occurred over Wi-Fi when one of my DNS servers went down unexpectedly. Reproducing over cellular to get bug reports, because this Wi-Fi network blocks Tailscale domains and the bug reports would be lacking information :^) but this should still occur over Wi-Fi ### Are there any recent changes that introduced the issue? _No response_ ### OS iOS ### OS version iOS 26.1 public beta (build 23B5059e) ### Tailscale version 1.89.185 ### Other software _No response_ ### Bug report BUG-536bdc65ec63b13b9060c4f109db547043b7050f4ffaa73444bf4ebc4a80fb21-20251013175411Z-1943a2a26d893815 and BUG-536bdc65ec63b13b9060c4f109db547043b7050f4ffaa73444bf4ebc4a80fb21-20251013180405Z-964dc328e3d5e671

github.com/tailscale/tailscale

Frequent disconnection on IOS

opened 01:46PM - 18 Nov 25 UTC

gregwelldone

needs-triage bug

### What is the issue? Dear all, I am using tailscale to access HA remotely on …IOS 26. It used to work flawlessly but since a few weeks, there is frequent disconnection (using a webpage or HA companion). Remote connexion works perfectly when I access my tailscale network from a PC. Do you have any idea where the problem come from? ### Steps to reproduce _No response_ ### Are there any recent changes that introduced the issue? _No response_ ### OS IOS ### OS version IOS 26 ### Tailscale version 1.90.4 ### Other software Home Assistant companion ### Bug report _No response_

mestavy · January 2, 2026, 7:42pm

I ran into the same issue with my partner’s iPhone just now when trying to get her app set up for remote access through TailScale.

After digging around a bit, I resolved it by making sure the Home Assistant Companion App had access to cellular data. You can verify this on your iPhone by going to Settings>Apps>Home Assistant - make sure Local network and Cellular Data toggles are turned on.

For clarity, I am using the local (internal) address for both internal and external URLs.

Hope this helps!

x Stav