Device Unreachable

The device is online, but .local doesn't resolve

<hostname>.local names rely on mDNS, which Android phones and some Windows machines don't support. The device is fine. Your client just can't look up the name.

• Use the IP address: find the device in your router's client list (it appears under the hostname you set), or take the address the Flasher shows once it finds the drone, and open http://<ip>. In Aircast Ground Station on Android or Windows, or at fly.aircast.one, type it as the Device address under Settings → Device.
• Or use its Tailscale address: once the device is on your tailnet, its 100.x.x.x IP or <hostname>.<tailnet>.ts.net name works from anywhere, with no mDNS involved.

Opens in one browser but not another? That's an operator-side VPN or proxy, see VPN & Browser Conflicts.

The device never joined a network: the recovery hotspot

If the device has no way to reach you, it brings up its own Wi-Fi hotspot so you can always get to it. It does this when no Wi-Fi network is saved on it, and when its saved Wi-Fi fails (wrong password, network out of range) and it has no wired connection and no working cellular for about five minutes. A card flashed in fight mode never raises it.

• Network name: your device hostname (e.g. falcon; defaults to aircast if you didn't set one)
• Password: raspberry

Join that Wi-Fi from your laptop or phone, then open:

http://10.42.0.1

The drone's app opens. Fix the Wi-Fi under Settings → Device → Connection with Join a Wi-Fi network, or connect the device to Tailscale on the same page. Older drone software shows its dashboard instead, with tabs named Flight, Connect and Setup; join Wi-Fi from its Network page.

The device answers, but the app won't load

If the address answers but the app stays blank or shows an error, open the rescue page on the same address:

http://<hostname>.local/rescue

It shows whether the drone is online, a Software card to check for and install an update, and a Wi-Fi card to join a network.