Error while running webservice Connector

Hi All,
[SIZE=2]I got the following exception while running the web service Connector.
Could not run ‘readFile’.

com.wm.app.b2b.server.ServiceException: java.net.UnknownHostException: services.xmethods.net

and the webservice am trying to connect is this:

targetNamespace=“http://www.xmethods.net/sd/XMethodsFilesystemService.wsdl” xmlns:tns=“http://www.xmethods.net/sd/XMethodsFilesystemService.wsdl” xmlns:xsd=“http://www.w3.org/2001/XMLSchema” xmlns:soap=“http://schemas.xmlsoap.org/wsdl/soap/” xmlns=http://schemas.xmlsoap.org/wsdl/
when i invoked this webservice from browser it is working fine. But when th same webservice when i ran the got the error i stated above.

Please help me.

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