How can I reconnect a disconnected emulator to adb server without killing the server?

Question

At first, I ran 11 Bluestacks instances like this:

After some time using self made macro, one instance disconnected like this:

I just want reconnect emulator-5614 without killing adb server because other bluestacks instances are still running by my macro.

So I tried to reconnect the instance to sever by adb commanding at CMD, but I failed:

Answer 1

adb connect is for tcp/ip connections, which it seems you are not using. It's not clear how the emulator got disconnected, however if it's still running, try

adb reconnect device

to force reconnection.