I was trying to connect my adb to tcpip and have followed these steps
adb tcpip 5555
adb connect 18.104.22.168:5555
Try to do port forwarding,
adb forward tcp:<PC port> tcp:<device port>.
adb forward tcp:5555 tcp:5555.
sounds like 5555 port is captured so use other one. As I know 7612 is empty
C:\Users\m>adb forward tcp:7612 tcp:7612 C:\Users\m>adb tcpip 7612 restarting in TCP mode port: 7612 C:\Users\m>adb connect 192.168.1.12 connected to 192.168.1.12:7612
Be sure that you connect to the right IP address. (You can download Network Info 2 to check your IP)