Connection and reconnection taking a lot of time

Hi ppl. I am on a POC with 5 machines plus the Active Directory on a Win 2003 server,
the vdi hosts and the storage server each of them reside on a LDOM (four in total) created
on one sparc blade on a sun blade 6000, each vdi has 4 gb of memory and the storage server
has 3 gb (ARC size is 2GB) and one zfs partition of about 60gb.
The xVM server was created in a LDOM on an x68 blade on the
same sun blade 6000. Solaris 10 U7 in all of them. VDI and virtualbox installed as per
installation instructions. All vdi servers has the AD as their ntp and dns server.
The user directory is working, connected and authenticated to the AD, we are able to search
for users from the web interface.
the problem: most of the time the vdi login screen appears after less than 30 secs, but
after entering a valid (or for testing, invalid) user/password, most of the time the "connecting
to vdi" screen is displayed for 1 or more minutes, after which it either falls back to the
vdi login screen or opens a the session or shows the two VMs to pick one. After selecting
one of the VMs or entering the previous session, everything works fast, inside the win
session, but then again, when we log out,disconnect or close the session, it takes for
anoter 2 or more minutes to get the VDI login screen again, it has taken up to 5 to 6 mins
to get to the vdi screens.
I dont find any related information on the cacao.0 logs, dmesg or /var/log/syslog log files,
the vdi web admin interface shows the VM taken by the user used in the vdi login screen,
also, just got kicked out of the vdi web admin with an error (will be posted on the next
message, what can we be doing wrong? what should we look at?
thanks in advance
-Oswaldo

error:
Error Details
Here is a full stack trace of the error:
javax.servlet.ServletException: javax.faces.FacesException: org.apache.jasper.el.JspELException: /jsp/pools/PoolDesktops.jsp(187,116) '#{PoolDesktopsBean.pool.vcDesktopProvider}' Error reading 'pool' on type com.sun.vda.admin.pools.PoolDesktopsBean
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:256)
     at sun.reflect.GeneratedMethodAccessor147.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:283)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:56)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:189)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)
     at com.sun.webui.jsf.util.UploadFilter.doFilter(UploadFilter.java:267)
     at sun.reflect.GeneratedMethodAccessor146.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:218)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:56)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:189)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)
     at com.sun.vda.admin.authentication.AuthenticationFilter.doFilter(Unknown Source)
     at sun.reflect.GeneratedMethodAccessor56.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:218)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:56)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:189)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.valves.RequestFilterValve.process(RequestFilterValve.java:269)
     at org.apache.catalina.valves.RemoteAddrValve.invoke(RemoteAddrValve.java:81)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     at java.lang.Thread.run(Thread.java:595)
Caused by: javax.faces.FacesException: javax.faces.FacesException: org.apache.jasper.el.JspELException: /jsp/pools/PoolDesktops.jsp(187,116) '#{PoolDesktopsBean.pool.vcDesktopProvider}' Error reading 'pool' on type com.sun.vda.admin.pools.PoolDesktopsBean
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:675)
     at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:647)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:681)
     at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:647)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:681)
     at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:647)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:681)
     at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:647)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:681)
     at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:647)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:681)
     at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:647)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:681)
     at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:647)
     at com.sun.faces.extensions.avatar.components.PartialTraversalViewRootHelper.invokeContextCallbackOnSubtrees(PartialTraversalViewRootHelper.java:596)
     at com.sun.faces.extensions.avatar.components.PartialTraversalViewRootHelper.processDecodes(PartialTraversalViewRootHelper.java:234)
     at com.sun.faces.extensions.avatar.components.PartialTraversalViewRootImpl.processDecodes(PartialTraversalViewRootImpl.java:145)
     at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:101)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
     at com.sun.faces.extensions.avatar.lifecycle.PartialTraversalLifecycle.execute(PartialTraversalLifecycle.java:94)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
     ... 54 more
Caused by: javax.faces.FacesException: org.apache.jasper.el.JspELException: /jsp/pools/PoolDesktops.jsp(187,116) '#{PoolDesktopsBean.pool.vcDesktopProvider}' Error reading 'pool' on type com.sun.vda.admin.pools.PoolDesktopsBean

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