application launch failed on windows pc

while openeing the NMS console on windos pc i am getting the below mentioned error. earlier it was working fine.

java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 403 Tunnel or SSL Forbidden"
at sun.net.www.protocol.http.HttpURLConnection.doTunneling(HttpURLConnection.java:2152)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:183)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1570)
at sun.net.www.protocol.http.HttpURLConnection.access$200(HttpURLConnection.java:92)
at sun.net.www.protocol.http.HttpURLConnectionS9.run(HttpURLConnection.java:1490)
at sun.net.www.protocol.http.HttpURLConnection$9.run(HttpURLConnection.java:1488)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessController.doPrivilegedWithCombiner(AccessController.java:784)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1487)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:268)
at com.sun.deploy.net.HttpUtils.followRedirects(Unknown Source)
at com.sun.deploy.net.BasicHttpRequest.doRequest(Unknown Source)
at com.sun.deploy.net.BasicHttpRequest.doHeadRequestEX(Unknown Source)
at com.sun.deploy.cache.ResourceProviderImpl.checkUpdateAvailable(Unknown Source)
at com.sun.deploy.cache.ResourceProviderImpl.isUpdateAvailable(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)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main.access$000(Unknown Source)
at com.sun.javaws.MainS1.run(Unknown Source)
at java.lang.Thread.run(Thread.java:748)