Error 502

Hello, there!
I'm having a "502 Proxy Error. The ISA Server denied the specified Uniform Resource Locator (URL)" error while trying to call an XI webservice from MII 12.0 using a "WebService XI" action.
Both MII and XI are on the same machine. I'm using a WSDL file that was exported from XI and stored as a local file.
I suppose it is a network issue.
Does anyone have a clue?
Thanks a lot!

Mike,
The name gets resolved as we can ping it normally.
This is what NW logs show us:
SOAP Invoke Error For http://<server>:<port>/XISOAPAdapter/MessageServlet?channel=:WBI_Sender:CC_SND_SOAP_fromSOAP_toFile_SARAH02&version=3.0&Sender.Service=WBI_Sender&Interface=http%3A%2F%2Fcsa.com.br%2Fpi%2FWebServicesTest%2FTestInterPI%5EMI_OB_PI_SARAH02
[EXCEPTION]
java.lang.Exception: Status (502): Proxy Error ( The ISA Server denied the specified Uniform Resource Locator (URL). )
at com.sap.lhcommon.webservice.SoapClient.invoke(SoapClient.java:114)
at com.sap.xmii.xacute.actions.xi.WebServiceXIAction.getOutgoingXml(WebServiceXIAction.java:91)
at com.sap.xmii.xacute.actions.webservice.WebServiceAction.RawInvoke(WebServiceAction.java:474)
at com.sap.xmii.xacute.actions.webservice.WebServiceAction.Invoke(WebServiceAction.java:511)
at com.sap.xmii.xacute.core.Action.Process(Action.java:72)
at com.sap.xmii.xacute.engine.TransactionEngine.Process(TransactionEngine.java:104)
at com.sap.xmii.xacute.core.ActionSequence.Process(ActionSequence.java:25)
at com.sap.xmii.xacute.engine.TransactionEngine.Process(TransactionEngine.java:104)
at com.sap.xmii.xacute.core.ActionSequence.Process(ActionSequence.java:31)
at com.sap.xmii.xacute.engine.TransactionEngine.Process(TransactionEngine.java:104)
at com.sap.xmii.xacute.engine.TransactionEngine.Execute(TransactionEngine.java:48)
at com.sap.xmii.servlet.Runner.service(Runner.java:173)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.runtime.FilterChainImpl.runServlet(FilterChainImpl.java:117)
at com.sap.engine.services.servlets_jsp.server.runtime.FilterChainImpl.doFilter(FilterChainImpl.java:62)
at com.sap.xmii.system.SecurityFilter.doFilter(SecurityFilter.java:100)
at com.sap.engine.services.servlets_jsp.server.runtime.FilterChainImpl.doFilter(FilterChainImpl.java:58)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:384)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:386)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:364)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:1039)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:265)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:102)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:172)

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