[jcifs] Failover with jCIFS NTLM authentication

[Jan Kundmüller]

Hello all,

We have setup a test DNS record that is used to have a "round robin" load
balancing/failover (see also http://en.wikipedia.org/wiki/Round_robin_dns )
for our jCIFS NTLM authentication.

To show what is meant, here a mocked nslookup (ad1, ad2, ad3 stand for the
IP adresses of Windows AD2003 DCs):
root at ourhost:/home/root#nslookup testdc
Server:  ad1.gad.intra.net
Address:  ad1

Name:    testdc.intra.net
Addresses: ad1, ad2, ad3

Unfortunately the jCIFS NTLM authentication does not work with that
configuration. We get the error message: "jcifs.smb.SmbException: A
duplicate name exists on the network.".
Exception is attached. We are using the "jCIFS 1.2.9 released" version with
a fixed domain controller (resolved via DNS) and preauthentication
(required for SMB signing).

Any thoughts, comments, ideas (maybe another way to have failover with
jCIFS NTLM and DNS, but not with WINS)? Thanks ahead!
Best regards, Jan

Exception:
[13.04.07 08:27:14:009 CEST] 2a6e9490 WebGroup      E SRVE0026E:
[Servlet-Fehler]-[A duplicate name exists on the network.]:
jcifs.smb.SmbException: A duplicate name exists on the network.
      at jcifs.smb.SmbTransport.checkStatus(SmbTransport.java:510)
      at jcifs.smb.SmbTransport.send(SmbTransport.java:610)
      at jcifs.smb.SmbSession.sessionSetup(SmbSession.java:269)
      at jcifs.smb.SmbSession.send(SmbSession.java:225)
      at jcifs.smb.SmbTree.treeConnect(SmbTree.java:147)
      at jcifs.smb.SmbSession.sessionSetup(SmbSession.java:262)
      at jcifs.smb.SmbSession.send(SmbSession.java:225)
      at jcifs.smb.SmbTree.treeConnect(SmbTree.java:147)
      at jcifs.smb.SmbSession.logon(SmbSession.java:161)
      at jcifs.smb.SmbSession.logon(SmbSession.java:154)
      at jcifs.http.NtlmServlet.service(NtlmServlet.java:137)
      at jcifs.http.NtlmJspBase.service(NtlmJspBase.java:62)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
      at
com.ibm.ws.webcontainer.jsp.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:344)
      at
com.ibm.ws.webcontainer.jsp.servlet.JspServlet.serviceJspFile(JspServlet.java:662)
      at
com.ibm.ws.webcontainer.jsp.servlet.JspServlet.service(JspServlet.java:760)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
      at
com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
      at
com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
      at
com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
      at
com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
      at
com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
      at
com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
      at
com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
      at
com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:974)
      at
com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:555)
      at
com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:200)
      at
com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:119)
      at
com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:276)
      at
com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
      at
com.ibm.ws.webcontainer.cache.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:114)
      at
com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:186)
      at
com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
      at
com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
      at
com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:618)
      at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:443)
      at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:593)






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