I tried to deploy a simple web application.. followed the tutorial given on 
google app engine website for java.. i was trying to deploy guestbook 
application which is given in demos folder of App Engine Java SDK.
while i tried to deploy it i got unable to update error.. i googled this 
problem bt got nthing significant..evry1 worte its may be a proxy error.. i 
believe its nt a proxy problem as i am able to open 
http://appengine.google.com in my browser without any problem... i m nt 
using Eclipse.. trying to deploy it by using cmd on windows..
please suggest me some solution..

here is the error log file:

Unable to update:
java.net.UnknownHostException: appengine.google.com
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
    at java.net.Socket.connect(Socket.java:519)
    at 
com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:550)
    at 
com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:141)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
    at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:272)
    at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:329)
    at 
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:172)
    at 
sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:793)
    at 
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:158)
    at 
sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:896)
    at 
sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:230)
    at 
com.google.appengine.tools.admin.AbstractServerConnection.connect(AbstractServerConnection.java:120)
    at 
com.google.appengine.tools.admin.AbstractServerConnection.send(AbstractServerConnection.java:229)
    at 
com.google.appengine.tools.admin.AbstractServerConnection.post(AbstractServerConnection.java:207)
    at 
com.google.appengine.tools.admin.AppVersionUpload.send(AppVersionUpload.java:638)
    at 
com.google.appengine.tools.admin.AppVersionUpload.beginTransaction(AppVersionUpload.java:446)
    at 
com.google.appengine.tools.admin.AppVersionUpload.doUpload(AppVersionUpload.java:137)
    at 
com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:259)
    at 
com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:47)
    at 
com.google.appengine.tools.admin.AppCfg$UpdateAction.execute(AppCfg.java:572)
    at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:144)
    at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:65)
    at com.google.appengine.tools.admin.AppCfg.main(AppCfg.java:61)
com.google.appengine.tools.admin.AdminException: Unable to update app: 
appengine.google.com
    at 
com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:264)
    at 
com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:47)
    at 
com.google.appengine.tools.admin.AppCfg$UpdateAction.execute(AppCfg.java:572)
    at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:144)
    at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:65)
    at com.google.appengine.tools.admin.AppCfg.main(AppCfg.java:61)
Caused by: java.net.UnknownHostException: appengine.google.com
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
    at java.net.Socket.connect(Socket.java:519)
    at 
com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:550)
    at 
com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:141)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
    at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:272)
    at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:329)
    at 
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:172)
    at 
sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:793)
    at 
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:158)
    at 
sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:896)
    at 
sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:230)
    at 
com.google.appengine.tools.admin.AbstractServerConnection.connect(AbstractServerConnection.java:120)
    at 
com.google.appengine.tools.admin.AbstractServerConnection.send(AbstractServerConnection.java:229)
    at 
com.google.appengine.tools.admin.AbstractServerConnection.post(AbstractServerConnection.java:207)
    at 
com.google.appengine.tools.admin.AppVersionUpload.send(AppVersionUpload.java:638)
    at 
com.google.appengine.tools.admin.AppVersionUpload.beginTransaction(AppVersionUpload.java:446)
    at 
com.google.appengine.tools.admin.AppVersionUpload.doUpload(AppVersionUpload.java:137)
    at 
com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:259)
    ... 5 more

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