[Bug]: Trouble establishing the connection when Server address is defined as domain with Android Private DNS enabled

[DumpAndForget]

Before submitting, please confirm

• I read the README and followed all setup steps in order
• I verified that my GPR key is valid and correctly passed to the environment
• I searched existing issues and found no duplicates
• I am using the latest version of the app

Flutter Doctor output

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Platform

Android

Build mode

Release

Environment details

• OS: Android 15
• Device: Sony Xperia 10 VI (XQ-ES72)
• Architecture: arm64

App version

v2026.8.18

Steps to reproduce

1. Enable Private DNS in Android settings
2. Add a server to your TrustTunnel app that has a domain name address, not an IP.
3. Reboot the phone
4. After the reboot go to TrustTunnel and try to start the tunnel.

Expected behavior

The tunnel is established

Actual behavior

For at least a couple of times it will almost instantly fail to start. On this Xperia phone, I am able to establish the connection eventually (when I tap the button 5 times). On my personal Google Pixel phone with GrapheneOS I can't establish the connection at all after reboot until I disable Private DNS.

Screenshots

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Additional Information

It is my understanding the netd is responsible for resolving the domain name provided in server address.
I tried to feed the logs to Claude, and from what I understood in some occasions it is possible for the establishing tunnel to kill netd's connection to the DoT server. But at the same time netd has a cache, so if you "warm it up" by resolving the domain beforehand, it will work.