ABAP System Upgrade - Gui not connecting during STARTUP.bat

Hello Team,

I am doing my Ehp upgrade to current level in market, but had any issue in start-up GUI with SUM tool,. Please find the attached screenshot for your refernce,..

Error:

java.io.IOException: Server returned HTTP response code: 503 for URL: http://xxxxx:4239/sdtdsu.jnlp

  at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)

  at com.sun.deploy.net.HttpUtils.followRedirects(Unknown Source)

  at com.sun.deploy.net.BasicHttpRequest.doRequest(Unknown Source)

  at com.sun.deploy.net.BasicHttpRequest.doRequest(Unknown Source)

  at com.sun.deploy.net.BasicHttpRequest.doGetRequest(Unknown Source)

  at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)

  at com.sun.deploy.net.DownloadEngine.downloadResource(Unknown Source)

  at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)

  at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)

  at com.sun.javaws.Launcher.updateFinalLaunchDesc(Unknown Source)

  at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)

  at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)

  at com.sun.javaws.Launcher.launch(Unknown Source)

  at com.sun.javaws.Main.launchApp(Unknown Source)

Please help me out,..

Thank you,

Mohan Karamala.