@RobertPic:

du meinst warscheinlich diese hier:
( -> also doch ein Netzwerkproblem ?!)

dann werd ich wohl einen unserer Netzwerkspezialisten aufsuchen müssen ...

Vielen Dank nochmals für die Unterstützung.

Code:
org.jdom.JDOMException: Error on line 2: org.apache.crimson.parser/P-082 http://www.shk-branchenportal.de/sho...nfrageKopf.dtd
        at org.jdom.input.DOMBuilder.build(DOMBuilder.java:274)
        at Lieferterminanfrage.getXMLRequest(Lieferterminanfrage.java:72)
        at Lieferterminanfrage.service(Lieferterminanfrage.java:121)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
        at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:597)
        at org.apache.tomcat.servlets.InvokerServlet.service(InvokerServlet.java:257)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
        at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
        at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)
        at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
        at java.lang.Thread.run(Thread.java:484)

Root cause: java.net.NoRouteToHostException: Die Wartezeit für die Verbindung ist abgelaufen
        at org.apache.crimson.parser.Parser2.fatal(Parser2.java:3035)
        at org.apache.crimson.parser.Parser2.externalParameterEntity(Parser2.java:2723)
        at org.apache.crimson.parser.Parser2.maybeDoctypeDecl(Parser2.java:1154)
        at org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:488)
        at org.apache.crimson.parser.Parser2.parse(Parser2.java:304)
        at org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:433)
        at org.apache.crimson.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:179)
        at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:86)
        at java.lang.reflect.Method.invoke(Native Method)
        at org.jdom.adapters.JAXPDOMAdapter.getDocument(JAXPDOMAdapter.java:146)
        at org.jdom.input.DOMBuilder.build(DOMBuilder.java:230)
        at Lieferterminanfrage.getXMLRequest(Lieferterminanfrage.java:72)
        at Lieferterminanfrage.service(Lieferterminanfrage.java:121)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
        at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:597)
        at org.apache.tomcat.servlets.InvokerServlet.service(InvokerServlet.java:257)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
        at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
        at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)
        at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
        at java.lang.Thread.run(Thread.java:484)