Error when using Check For Updates

When I try to get updates using Help->Check For Updates I got following error:
java.io.IOException: Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/html4/loose.dtd
     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1313)
     at java.net.URL.openStream(URL.java:1010)
     at oracle.xml.parser.v2.XMLReader.openURL(XMLReader.java:2639)
     at oracle.xml.parser.v2.XMLReader.pushXMLReader(XMLReader.java:301)
     at oracle.xml.parser.v2.NonValidatingParser.pushExternalDTD(NonValidatingParser.java:607)
     at oracle.xml.parser.v2.NonValidatingParser.parseDoctypeDecl(NonValidatingParser.java:523)
     at oracle.xml.parser.v2.NonValidatingParser.parseProlog(NonValidatingParser.java:355)
     at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:313)
     at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:225)
     at oracle.javatools.xml.esax.spi.ExtensibleSAXParser.parse(ExtensibleSAXParser.java:65)
     at oracle.ideimpl.webupdate.parser.MasterListParser.parse(MasterListParser.java:47)
     at oracle.ideimpl.webupdate.CheckMasterListRunnable.run(CheckMasterListRunnable.java:148)
     at java.lang.Thread.run(Thread.java:619)
After examining the response I found following link [http://w3.org/brief/MTE2] in response.
Does any one know how to fix it ?

java.io.IOException: Server returned HTTP response code: 503 for URL: http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd
     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1313)
     at java.net.URL.openStream(URL.java:1010)
     at oracle.xml.parser.v2.XMLReader.openURL(XMLReader.java:2639)
     at oracle.xml.parser.v2.XMLReader.pushXMLReader(XMLReader.java:301)
     at oracle.xml.parser.v2.NonValidatingParser.pushExternalDTD(NonValidatingParser.java:607)
     at oracle.xml.parser.v2.NonValidatingParser.parseDoctypeDecl(NonValidatingParser.java:523)
     at oracle.xml.parser.v2.NonValidatingParser.parseProlog(NonValidatingParser.java:355)
     at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:313)
     at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:225)
     at oracle.javatools.xml.esax.spi.ExtensibleSAXParser.parse(ExtensibleSAXParser.java:65)
     at oracle.ideimpl.webupdate.parser.MasterListParser.parse(MasterListParser.java:47)
     at oracle.ideimpl.webupdate.CheckMasterListRunnable.run(CheckMasterListRunnable.java:148)
     at java.lang.Thread.run(Thread.java:619)
the same error
problem still exist
is there a workaround?

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