Load Balancing not load balancing!

Hi,
We have inherited a 6.3 2005 Q1 installation of Access Manager that has the following problem.
All logons appear to be load balanced correctly however all Policy Agent requests are expressing a preference for one or other node at a time.
For example, during the last 4 days all PA traffic has been hitting Srv01. This leads to an 80/20 balance. This morning on Srv01 an error in the amSession logs appeared on Srv01, "SessionRequestHandler NullPointerException" and from this point on Srv02 started to take the Policy Agent requests. So now the traffic is still 80/20 but wth Srv02 handling the 'lion's share'.
Can anyone point me to documentation that describes in detail how Load Balancing working in the products?
Thanks,
EddieT

Hi,
Sorry I should have been more specific. The error we are seeing has been reported before but no resolution posted.
Thanks.
29/05/2009 08:57:05:119 AM IST: Thread[service-j2ee,11,main]
ERROR: SessionRequestHandler encounterd exception
com.iplanet.sso.SSOException: Session was not obtained.
at com.iplanet.sso.providers.dpro.SSOProviderImpl.createSSOToken(SSOProviderImpl.java:177)
at com.iplanet.sso.SSOTokenManager.createSSOToken(SSOTokenManager.java:305)
at com.sun.identity.session.util.RestrictedTokenContext.unmarshal(RestrictedTokenContext.java:125)
at com.iplanet.dpro.session.service.SessionRequestHandler.processRequest(SessionRequestHandler.java:139)
at com.iplanet.dpro.session.service.SessionRequestHandler.process(SessionRequestHandler.java:112)
at com.iplanet.services.comm.server.PLLRequestServlet.handleRequest(PLLRequestServlet.java:195)
at com.iplanet.services.comm.server.PLLRequestServlet.doPost(PLLRequestServlet.java:147)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:767)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
at sun.reflect.GeneratedMethodAccessor203.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:249)
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:282)
at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:257)
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:55)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:161)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:263)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:933)
at com.sun.enterprise.web.connector.httpservice.HttpServiceProcessor.process(HttpServiceProcessor.java:234)
at com.sun.enterprise.web.HttpServiceWebContainer.service(HttpServiceWebContainer.java:2124)

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    Update: We tried to capture the requests through fiddler and observed that when fiddler is running on the client computer then the connection works perfectly fine even through the load balancer. Probably fiddler is reformatting the SOAP
    envelop of the web service requests the way it should before sending the request to the server.
    If we do not run fiddler and run some other similar tool (like Charles) then it again gives the issue and the request stucks at /PWA/_vti_bin/psi/winproj.asmx
    We ran Wireshark on the servers and found the following for that web service call:
    [TCP Previous segment not captured] Continuation or non-HTTP traffic.
    Please let me know if someone could provide any hint what can be done next.
    Regards, Amit Gupta

    There are several ways to configure your load balancer.   I would suggest that you work with the network engineer, the load balancer vendor and your project administrator to resolve this issue. 
    Basically you need URL to be resolved correctly.  Also, I don't believe PS2007 did a good job handling load balancing, so you may need to bring someone in good with IIS and see they can tweek IIS to manage the cache better.
    As I go back and look at your analysis, I think you should probably look at upgrading to Project Server 2013.  They made some improvement in load balancing and the management of distributive cache.
    I assume you have 4 WFE because you have thousands of project users.  Roughly how many  you have?  Over 1000, over 5000
    Have you tried to see if using two load balancing work?  How about just one front end.  I often see companies scaling SharePoint and Project server to extremes. 
    Michael Wharton, MVP, MBA, PMP, MCT, MCTS, MCSD, MCSE+I, MCDBA
    Website http://www.WhartonComputer.com
    Blog http://MyProjectExpert.com contains my field notes and SQL queries

  • RE: (forte-users) Call to the load-balanced SO not throughrouter

    We never call an SO from within an SO. Instead we do the following :
    MySO is mapped to MySOclass.
    MySOclass is a facade which has an attribute for every Policy Manager
    related to this SO.
    Each Policy manager is instanciated in MySOclass.
    Each Policy manager has an attribute called Parent.
    Parent is defined by MySOclass to be self.
    If two Policy managers need to work together we invoke methods via the
    parent attribute :
    Example
    I have a partition for Enrolments.
    It has three Policy Managers within it
    a Students Policy Manager (with a Add, Delete, Get methods)
    a Courses Policy Manager (with a Add, Delete, Get methods).
    an Enrolments Policy Manager (with a Add, Delete, Get methods).
    To enable this partition we have defined :
    EnrolmentsSO (environment visible, message duration) with the EnrolmentsMgr
    class as its related class.
    The EnrolmentsMgr class has the following methods and attributes :
    Methods :
    AddStudent
    AddCourse
    AddEnrolment
    GetStudent
    GetCourse
    GetEnrolment
    DeleteStudent
    DeleteCourse
    DeleteEnrolment
    All of these methods do a one line return statement, simply passing the
    method invocation to
    the appropriate Policy Manager. For example AddStudent would say
    Return theStudentPM.AddStudent(pInStudentParams : pInStudentParams)
    : pOutStudentParams
    In the Init method for the EnrolmentsMgr we instanciate the following
    attributes :
    theStudentPM (which is typed to the StudentPM class)
    theCoursePM (which is typed to the CoursePM class)
    theEnrolmentsPM (which is typed to the EnrolmentsPM class)
    Also in the Init method we set an attribute (called parent) on each
    PM to the value of Self.
    Then when one PM needs to invoke a method on another PM we simply do :
    For example in the theEnrolmentPM.GetEnrolment method we need to get
    Students and Courses
    thus we code :
    Parent.GetStudent(pInStudentParams = pInStudentParams) : pOutStudentParams
    Parent.GetCourse((pInCourseParams = pOutStudentParams.CourseStuff) :
    pOutCourseParams
    Build Enrol details based on student / course stuff.
    Return EnrolmentParams.
    Hope this makes sense.
    Regards,
    Chris Will, Dept. of Educ. Training, ITB, Sydney, Australia
    -----Original Message-----
    From: Peter Sham [mailto:[email protected]]
    Sent: Friday, 8 October 1999 9:35
    To: [email protected]; [email protected]
    Subject: Re: (forte-users) Replicating the PersistenceMgrSO
    Hi,
    Whenever you make a call to your load-balanced SO, it
    would go through the router. That is what I
    understand. No matter you make the call from inside
    or outside the SO.
    Secondly, you can turn on the "fail-over" option of a
    router but not load-balanced it. On these routers,
    you can check their instruments to see which one is
    really running.
    Hope this help.
    Regards,
    Peter Sham.

    We never call an SO from within an SO. Instead we do the following :
    MySO is mapped to MySOclass.
    MySOclass is a facade which has an attribute for every Policy Manager
    related to this SO.
    Each Policy manager is instanciated in MySOclass.
    Each Policy manager has an attribute called Parent.
    Parent is defined by MySOclass to be self.
    If two Policy managers need to work together we invoke methods via the
    parent attribute :
    Example
    I have a partition for Enrolments.
    It has three Policy Managers within it
    a Students Policy Manager (with a Add, Delete, Get methods)
    a Courses Policy Manager (with a Add, Delete, Get methods).
    an Enrolments Policy Manager (with a Add, Delete, Get methods).
    To enable this partition we have defined :
    EnrolmentsSO (environment visible, message duration) with the EnrolmentsMgr
    class as its related class.
    The EnrolmentsMgr class has the following methods and attributes :
    Methods :
    AddStudent
    AddCourse
    AddEnrolment
    GetStudent
    GetCourse
    GetEnrolment
    DeleteStudent
    DeleteCourse
    DeleteEnrolment
    All of these methods do a one line return statement, simply passing the
    method invocation to
    the appropriate Policy Manager. For example AddStudent would say
    Return theStudentPM.AddStudent(pInStudentParams : pInStudentParams)
    : pOutStudentParams
    In the Init method for the EnrolmentsMgr we instanciate the following
    attributes :
    theStudentPM (which is typed to the StudentPM class)
    theCoursePM (which is typed to the CoursePM class)
    theEnrolmentsPM (which is typed to the EnrolmentsPM class)
    Also in the Init method we set an attribute (called parent) on each
    PM to the value of Self.
    Then when one PM needs to invoke a method on another PM we simply do :
    For example in the theEnrolmentPM.GetEnrolment method we need to get
    Students and Courses
    thus we code :
    Parent.GetStudent(pInStudentParams = pInStudentParams) : pOutStudentParams
    Parent.GetCourse((pInCourseParams = pOutStudentParams.CourseStuff) :
    pOutCourseParams
    Build Enrol details based on student / course stuff.
    Return EnrolmentParams.
    Hope this makes sense.
    Regards,
    Chris Will, Dept. of Educ. Training, ITB, Sydney, Australia
    -----Original Message-----
    From: Peter Sham [mailto:[email protected]]
    Sent: Friday, 8 October 1999 9:35
    To: [email protected]; [email protected]
    Subject: Re: (forte-users) Replicating the PersistenceMgrSO
    Hi,
    Whenever you make a call to your load-balanced SO, it
    would go through the router. That is what I
    understand. No matter you make the call from inside
    or outside the SO.
    Secondly, you can turn on the "fail-over" option of a
    router but not load-balanced it. On these routers,
    you can check their instruments to see which one is
    really running.
    Hope this help.
    Regards,
    Peter Sham.

  • Load balancing not happening on UDQ in weblogic 11g

    Hi Team,
    I have a 2 clusters with two managed servers each on different machines
    Cluster A(On machine 1)
    Managed server A (on machine 1)
    Managed server B(on machine 2)
    I have created 2 JMS servers
    JMS Server A on Managed server A
    JMS Server Bon Managed server B
    and a JMS module on Cluster A
    and JMS connection factory targeted on Cluster A and a uniform distributed queue targeted on JMS server A and JMS Server B
    But load balancing is not happening only one managed server is loaded at a time.. Using weblogic 11(aka 10.2.3)
    Tried disabling server affinity but it did not help ...Can any one please let me know how to fix this?

    Hi,
    When you say load is not balanced and reaching only one managed server.
    I assume both the UDD's targets are reachable and are visible in JNDI tree ?
    also , what kind of application is it - i,e is it clustered app that would be seen as consumers on each UDQ ?
    take a look at the app and check if its clusterred . along with that also take a look at the number of consumers on UDQ instances.
    Let me know what you find.
    Sri

  • HTTP logs not created when using software load balancer

    This is my setup:
    1. I have a server running a software load balancer - call it A
    2. There are two servers clustered under A - call it X and Y
    3. I am able to access the application deployed on X and Y through A.
    Fail-over also works. Shutting down X when the application is up and running routes the requests to Y and vice-versa. All is well until this point.
    Problem is:
    Let us take server X.
    $ORACLE_HOME/Apache/Apache/logs does not have an access log in it. (It
    however has an error log.)
    Access logs are not created when accessing the servers in the cluster (X and Y) through the load balancer URL.
    However, when accessing the individual servers in the cluster (with their URLs), access logs are created.
    Specifics on the setup:
    1. A, X, Y - all three are OAS 10.1.3.2
    2. All three are deployed on individual server machines
    3. All three servers have one OC4J instance each running in them
    4. The software load balancer used is from WebLogic 8.1sp5 - basically to create a *.war file that has the details of X and Y (servers in the cluster)
    5. This *.war file is deployed on A
    6. Server A, the one that has the software load balancer, DOES NOT have AS control. One of the other servers in the cluster does.
    Has anybody encountered this problem before? Or is there anything wrong
    with the setup? What is the resolution for the same?
    Any help is greatly appreciated.
    Thank you.

    Thank you, Jacco. You are right in saying that the software load balancer does not route the request to Apache and hence the logs are not created.
    While the logs are not critical to the component we are working on, was just wondering why they were not being created.
    As regards your comment on FastCGI, there is a FastCGI directory created under $ORACLE_HOME/Apache/Apache/logs - but there is nothing in it. Neither do the error logs have any information pertaining to FastCGI.
    Anyway, I am not going to worry about this issue anymore - may be sometime in the future will try to use a different software load balancer and see if it makes any difference.

  • Site behind load balancer - Key not valid for use in specified state

    Hi,
    I have created a sharepoint application page to access an active end point on ADFS and establish a fedauth session. All works well in single server. But when the page runs behind load balancer with 2 servers, it fails with key not valid for use in specified
    state exception. Stickiness is enabled on load balancer. verified that.
    I had made few changes to config file in microsoft.identitymodel section to accomodate adfs custom login. This included removing securitytokenhandlers and issuertokenresolvers as well. Is this impacting the encryption/decryption in anyway?
    Any pointers would help.
    Reference point for my application page : http://blog.helloitsliam.com/Lists/Posts/Post.aspx?ID=76

    Hi,
    As I understand, you encountered the error “Key not valid for use in specified state” when ADFS custom login.
    In order to run in Windows Azure Web Sites a Web application which uses WIF for handling authentication, you must change the default cookie protection method (DPAPI, not available on Windows Azure Web Sites) to something that will work in a farmed environment
    and with the IIS’ user profile load turned off.
    1. If you are using the Identity and Access Tools for VS2012, just go to the Configuration tab and check the box “Enable Web farm ready cookies”.
    2. If you want to do things by hand, add the following code snippet in your system.identitymodel/identityConfiguration element:
       <securityTokenHandlers>
         <add type="System.IdentityModel.Services.Tokens.MachineKeySessionSecurityTokenHandler, 
                 System.IdentityModel.Services, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
          <remove type="System.IdentityModel.Tokens.SessionSecurityTokenHandler,
                System.IdentityModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
        </securityTokenHandlers>
    There is a similar case:
    http://stackoverflow.com/questions/19323287/key-not-valid-for-use-in-specified-state-error-for-net-4-5-mvc-4-application
    Best regards,
    Sara Fan
    TechNet Community Support
    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
    [email protected]

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