Time out error on deploying to SAP-J2EE engine.

Question

I got a problem while deploying to SAP-J2EE engine using ant. It takes a lot of time and then throws a time out error.
The problem is with the web.xml file pointing to a DTD in the internet, I have pasted some part of the web.xml below,
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE web-app
  PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
  "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
    <display-name>MyPay</display-name>
    <description>MyPay</description>
Once I write down the DTD description in the web.xml itself, it works fine.
I have pasted the error trace below,
j2eedeploy:
     [echo] Deploying to Local environment...
     [echo] C:\Java\Projects/MyPay/dist/MyPay.ear
BUILD FAILED
C:\Java\Projects\MyPay\build.xml:445: java.lang.RuntimeException: ERROR: ID90507:  Error occured during getting EARDescriptor : Failed to load resource from the context classloader of the current thread! Loading from classloader was caused by: java.net.ConnectException: Connection timed out: connect
Exception is :
java.io.IOException: Failed to load resource from the context classloader of the current thread! Loading from classloader was caused by: java.net.ConnectException: Connection timed out: connect
     at com.sap.engine.lib.xml.parser.URLLoaderBase.resolveEntity(URLLoaderBase.java:148)
     at com.sap.engine.lib.xml.parser.XMLParser.scanDTD(XMLParser.java:1271)
     at com.sap.engine.lib.xml.parser.XMLParser.scanProlog(XMLParser.java:2795)
     at com.sap.engine.lib.xml.parser.XMLParser.scanDocument(XMLParser.java:2830)
     at com.sap.engine.lib.xml.parser.XMLParser.parse0(XMLParser.java:229)
     at com.sap.engine.lib.xml.parser.AbstractXMLParser.parseAndCatchException(AbstractXMLParser.java:145)
     at com.sap.engine.lib.xml.parser.AbstractXMLParser.parse(AbstractXMLParser.java:160)
     at com.sap.engine.lib.xml.parser.AbstractXMLParser.parse(AbstractXMLParser.java:261)
     at com.sap.engine.lib.xml.parser.Parser.parseWithoutSchemaValidationProcessing(Parser.java:280)
     at com.sap.engine.lib.xml.parser.Parser.parse(Parser.java:342)
     at com.sap.engine.lib.xml.parser.DOMParser.parse(DOMParser.java:101)
     at com.sap.engine.lib.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:127)
     at com.inqmy.lib.xml.StandardDOMParser.parse(StandardDOMParser.java:127)
     at com.inqmy.lib.xml.StandardDOMParser.parse(StandardDOMParser.java:120)
     at com.inqmy.services.servlets_jsp.descriptor.jar.WebWar.getWebDescriptor(WebWar.java:98)
     at com.inqmy.deploy.tool.deployer.ExtendedEarReader.loadDescriptorFromFile(ExtendedEarReader.java:175)
     at com.inqmy.deploy.tool.deployer.ExtendedEarReader.getFullEarDescriptor(ExtendedEarReader.java:104)
     at com.inqmy.deploy.manager.DeployManagerImpl.setEar(DeployManagerImpl.java:355)
     at com.inqmy.deploy.manager.DeployManagerImpl.setEar(DeployManagerImpl.java:325)
     at com.pg.sap.deploy620.SAPDeploy620Manager.process(SAPDeploy620Manager.java:84)
     at com.pg.ant.tasks.j2ee620.J2ee620EngineDeployTask.execute(J2ee620EngineDeployTask.java:40)
     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
     at org.apache.tools.ant.Task.perform(Task.java:364)
     at org.apache.tools.ant.Target.execute(Target.java:341)
     at org.apache.tools.ant.Target.performTasks(Target.java:369)
     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
     at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
     at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
     at org.eclipse.ant.internal.ui.antsupport.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
     at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
     at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.run(InternalAntRunner.java:423)
     at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.main(InternalAntRunner.java:137)

Answer 1

Thanks for your reply Kalyan,
The problem seems to be with my system, because I had run the same ant script in another system and it deployed successfully.
The problem does not seem to be with the dtd, whereas it seems that the SAP-J2EE engine is not able to open the link to the dtd giving a time out error.
Is it possible to switch off the validation process of the SAP-J2EE engine of an xml with the dtd?