ADB not responding. You can wait more, or kill “adb.exe” … windows 8

Question

When I try to test my Android application with an android emulator as always I now suddenly get an error message. I\'m working with Windows 8. So far I tried the following thing

Answer 1

Maybe HTTP Proxy blocked the localhost 127.0.0.1:5037
If you have config the HTTP Proxy, make sure to exclude the localhost like picture below

Also, port can also be blocked by the firewall and anti-virus firewall, please notice as well.