Android ADB connect empty host name

Question

I use ADB over WiFi to connect to an Android device. When I type

adb connect <device ip>

I get error

empty hostname

Answer 1

For me, simply restarting adb solved the problem

adb kill-server
adb start-server

Answer 2

You need to change net.hostname property on your device. The easiest way is to use the setprop command via a root shell on the device.

setprop net.hostname TypeAnyHostName

If this is not working for you, see other solutions here. This is a temporary solution, the problem repeats again some time later.