An unknown server-side error occurred while processing the command. Could not proxy command to remote server. Original error: Error: socket hang up

Question

If I ran TestNG test class it displays error ------------

org.openqa.selenium.WebDriverException: An unknown server-side error occurred while processing the command. 
Original error: Could not proxy command to remote server. Original error: Error: socket hang up (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 281 milliseconds
Build info: version: '2.53.1', revision: 'a36b8b1cd5757287168e54b817830adce9b0158d', time: '2016-06-30 19:26:09'
System info: host: 'MON-PC305', ip: '10.101.0.119', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_144'
Driver info: io.appium.java_client.android.AndroidDriver
Capabilities [{appPackage=com.app.android.game.app, statBarHeight=84, noReset=false, viewportRect={top=84, left=0, width=1440, height=2308}, deviceName=emulator-5554, platform=LINUX, deviceUDID=emulator-5554, desired={app="app path", appPackage=com.app.android.game.app, appActivity=com.app.android.game.app.activities.login.riskWarningLogin.RiskWarningLoginActivity, noReset=false, automationName=uiautomator2, skipUnlock=true, platformName=Android, deviceName=emulator-5554}, platformVersion=9, webStorageEnabled=false, automationName=uiautomator2, takesScreenshot=true, skipUnlock=true, javascriptEnabled=true, platformName=Android, deviceApiLevel=28, deviceManufacturer=Google, app=C:\Users\***\eclipse-workspace\appname\app.apk, deviceScreenSize=1440x2560, networkConnectionEnabled=true, warnings={}, databaseEnabled=false, appActivity=com.app.android.game.app.activities.login.riskWarningLogin.RiskWarningLoginActivity, pixelRatio=3.5, locationContextEnabled=false, deviceScreenDensity=560, deviceModel=Android SDK built for x86}]
Session ID: d275d496-08b0-4652-9aa9-67ae0476cdc8

Answer 1

Stop the appium server and execute this:

adb uninstall io.appium.uiautomator2.server
adb uninstall io.appium.uiautomator2.server.test

Then restart the appium server and execute your scripts.

Answer 2

I ran into an exact error but the resolution was I had to just restart both my Android emulator and also Appium server. After that everything started working.