When trying to deploy an application on JBoss 3.2.7 we get (since today, could start the server yesterday) the following error (with the application failing to deploy):

15:30:45,293 ERROR [MainDeployer] Could not initialise deployment: file:/C:/tools/jboss-3.2.7/server/default/deploy/mxs-server-1.4.ear
org.jboss.deployment.DeploymentException: http://www.jboss.org/j2ee/dtd/jboss_xmbean_1_1.dtd; - nested throwable: (java.io.FileNotFoundException: http://www.jboss.org/j2ee/dtd/jboss_xmbean_1_1.dtd)
at org.jboss.deployment.SARDeployer.init(SARDeployer.java:173)
at org.jboss.deployment.MainDeployer.init(MainDeployer.java:696)
at org.jboss.deployment.MainDeployer.init(MainDeployer.java:713)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:631)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:604)
at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.server.ReflectedDispatcher.dispatch(ReflectedDispatcher.java:60)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:62)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:54)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:82)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:198)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:473)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
at $Proxy8.deploy(Unknown Source)
at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:304)
at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:478)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:201)
at org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:274)
at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:271)
at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:221)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.server.ReflectedDispatcher.dispatch(ReflectedDispatcher.java:60)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:62)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:54)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:82)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:198)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:473)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:899)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:415)
at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.server.ReflectedDispatcher.dispatch(ReflectedDispatcher.java:60)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:62)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:54)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:82)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:198)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:473)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
at $Proxy4.start(Unknown Source)
at org.jboss.deployment.SARDeployer.start(SARDeployer.java:251)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:829)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:641)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:604)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:588)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.server.ReflectedDispatcher.dispatch(ReflectedDispatcher.java:60)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:62)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:54)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:82)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:198)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:473)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
at $Proxy5.deploy(Unknown Source)
at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:407)
at org.jboss.system.server.ServerImpl.start(ServerImpl.java:311)
at org.jboss.Main.boot(Main.java:191)
at org.jboss.Main$1.run(Main.java:480)
at java.lang.Thread.run(Thread.java:534)
Caused by: java.io.FileNotFoundException: http://www.jboss.org/j2ee/dtd/jboss_xmbean_1_1.dtd
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:792)
at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.startDTDEntity(Unknown Source)
at org.apache.xerces.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at org.jboss.deployment.SARDeployer.parseDocument(SARDeployer.java:528)
at org.jboss.deployment.SARDeployer.init(SARDeployer.java:137)
... 66 more

When trying to retrieve the DTD manually I get a 404, the file is apparently no longer there.
Is this deliberate or in error, and what (if anything) can we do to prevent this problem?