# Unable to start application in app testing **URL:** \ **Category:** Desktop Testing\ **Tags:** desktop, windows, katalon-studio\ **Created:** [January 2, 2020, 2:54pm UTC](https://forum.katalon.com/t/unable-to-start-application-in-app-testing/38121 "2020-01-02T14:54:41Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![krista.strzeszkowski](https://avatars.discourse-cdn.com/v4/letter/k/f6c823/32.png) [@krista.strzeszkowski](https://forum.katalon.com/u/krista.strzeszkowski)\ **Post date:** [January 2, 2020, 2:54pm UTC](https://forum.katalon.com/t/unable-to-start-application-in-app-testing/38121/1 "2020-01-02T14:54:42Z")
I put in the path for the application I want Katalon to open to do some testing and it will not open. The error is `Unable to start application. Reason:. Connection refused: connect.` The details look like this ```auto Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53' System info: host: 'KRISTAS', ip: '10.xx.xx.xxx', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_181' Driver info: driver.version: WindowsDriver at com.kms.katalon.composer.components.impl.dialogs.ProgressMonitorDialogWithThread.runAndWait(ProgressMonitorDialogWithThread.java:49) at com.kms.katalon.composer.windows.dialog.WindowsAppComposite$5.run(WindowsAppComposite.java:198) at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:119) Caused by: org.openqa.selenium.WebDriverException: Connection refused: connect Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53' System info: host: 'KRISTAS', ip: '10.xx.xx.xxx', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_181' Driver info: driver.version: WindowsDriver at io.appium.java_client.remote.AppiumCommandExecutor.lambda$5(AppiumCommandExecutor.java:251) at io.appium.java_client.remote.AppiumCommandExecutor.execute(AppiumCommandExecutor.java:250) at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552) at io.appium.java_client.DefaultGenericMobileDriver.execute(DefaultGenericMobileDriver.java:42) at io.appium.java_client.AppiumDriver.execute(AppiumDriver.java:1) at io.appium.java_client.windows.WindowsDriver.execute(WindowsDriver.java:1) at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:213) at org.openqa.selenium.remote.RemoteWebDriver.(RemoteWebDriver.java:131) at io.appium.java_client.DefaultGenericMobileDriver.(DefaultGenericMobileDriver.java:38) at io.appium.java_client.AppiumDriver.(AppiumDriver.java:84) at io.appium.java_client.windows.WindowsDriver.(WindowsDriver.java:38) at com.kms.katalon.core.windows.driver.WindowsDriverFactory.newWindowsDriver(WindowsDriverFactory.java:170) at com.kms.katalon.core.windows.driver.WindowsDriverFactory.startApplication(WindowsDriverFactory.java:91) at com.kms.katalon.composer.windows.spy.WindowsInspectorController.startApplication(WindowsInspectorController.java:148) at com.kms.katalon.composer.windows.dialog.WindowsAppComposite$5$1.call(WindowsAppComposite.java:201) at com.kms.katalon.composer.components.impl.dialogs.ProgressMonitorDialogWithThread.startThreadAndWait(ProgressMonitorDialogWithThread.java:36) at com.kms.katalon.composer.components.impl.dialogs.ProgressMonitorDialogWithThread.runAndWait(ProgressMonitorDialogWithThread.java:48) ... 2 more Caused by: java.net.ConnectException: Connection refused: connect at okhttp3.internal.platform.Platform.connectSocket(Platform.java:129) at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:245) at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:165) at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:257) at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:135) at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:114) at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121) at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121) at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:126) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121) at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:200) at okhttp3.RealCall.execute(RealCall.java:77) at org.openqa.selenium.remote.internal.OkHttpClient.execute(OkHttpClient.java:103) at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:105) at io.appium.java_client.remote.AppiumCommandExecutor$1.createSession(AppiumCommandExecutor.java:186) at io.appium.java_client.remote.AppiumCommandExecutor.createSession(AppiumCommandExecutor.java:217) at io.appium.java_client.remote.AppiumCommandExecutor.execute(AppiumCommandExecutor.java:239) ... 17 more ``` I am not sure if it is something I am doing wrong or if the application does not have allowance to open this way? –Thanks! ---
**Author:** ![duyluong](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/duyluong/32/1116_2.png) [@duyluong](https://forum.katalon.com/u/duyluong)\ **Post date:** [February 12, 2020, 3:59am UTC](https://forum.katalon.com/t/unable-to-start-application-in-app-testing/38121/3 "2020-02-12T03:59:38Z")
You need to start WinAppDriver first. > **[Set up WinAppDriver](https://docs.katalon.com/katalon-studio/docs/setup-winappdriver.html#set-up-windows-application-driver-on-a-local-windows-10-machine)** > > First, you need to install WinAppDriver. Refer to Installing and Running Windows Application Driver to install a WinAppDriver. Remember to enable Developer Mode on the testing machine. Refer to the... ---
**Author:** ![nic](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/nic/32/16104_2.png) [@nic](https://forum.katalon.com/u/nic)\ **Post date:** [September 28, 2021, 6:56am UTC](https://forum.katalon.com/t/unable-to-start-application-in-app-testing/38121/4 "2021-09-28T06:56:28Z")
Hi, I am getting the same issue as above, but my problem is that my Katalon is installed on a VM that is running Windows 7 and thus I cannot install the WinAppDriver as explained above. Do you have any recommendations for me in this regard? I have to run windows 7 on the VM due to software limitations ---
**Author:** ![duyluong](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/duyluong/32/1116_2.png) [@duyluong](https://forum.katalon.com/u/duyluong)\ **Post date:** [September 29, 2021, 3:46am UTC](https://forum.katalon.com/t/unable-to-start-application-in-app-testing/38121/5 "2021-09-29T03:46:55Z")
Hi @nic, WinAppDriver can only be installed on Windows 10 only. Related documents: - [https://docs.katalon.com/katalon-studio/docs/setup-winappdriver.html#set-up-windows-application-driver-on-a-local-windows-10-machine](https://docs.katalon.com/katalon-studio/docs/setup-winappdriver.html#set-up-windows-application-driver-on-a-local-windows-10-machine) - [https://github.com/microsoft/WinAppDriver#windows-application-driver](https://github.com/microsoft/WinAppDriver#windows-application-driver)