NSAPI not sticky in a cluster

Hi!
I am using NSAPI(IPlanet on SOlaris) as web server as proxy and to serve static contents. My application lies on a cluster with two nodes of managed servers. NSAPI acting as a load-balancer needs to follow the sticky algorothm where it should direct the request from same client to the same node. It should use the session id or cookie to identify which server the session should be sticky to. But NSAPI rotates the requests between the two nodes in random. Since my session is replicated, this doesn't log the user out, but this behaviour is undesirable and not according to the bea docs.
Can anyone suggest how to debug this? Is there anything required on the plug-in side to be configured?
Regards,
Manish Agarwal.

Thanks Eric, but I still have not been able to figure this out. There is something
i want to add here, i checked with the vendor hosting our web serevers and he
replied that there is a hardware loadbalancer in front of the three web servers
distributing the requests between different servers based on load. So now that
the hardware loadbalancer is not sticky based on session id and cookie, can NSAPI
figure out which weblogic node did the last request go to.
Does the hardware loadbalancer need to support sticky sessions?
"Eric Gross" <[email protected]> wrote:
Not possible unless your configurations for the 3 Iplanets are different.
Set Debug=ALL and get the wlproxy.log.
Regards,
Eric
"Manish Agarwal" <[email protected]> wrote in message
news:[email protected]..
I just want to add that i have three instances of NSAPI as Web-Servers,
could it be possible that requests from client going through differentweb
servers instances cannot be sticky? That IPlanet cannot itself be sticky?
Manish Agarwal.

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16/09/2008 07:59:44 PM /userOut/deploy (com.sap.ide.eclipse.sdm.threading.DeployThreadManager) [Thread[Deploy Thread,5,main]] ERROR:
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Settings
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I found this messenger in Additional log information., Please si
17/09/2008 03:04:51 PM /userOut/deploy (com.sap.ide.eclipse.sdm.threading.DeployThreadManager) [Thread[Deploy Thread,5,main]] INFO:
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<!LOGHEADER[START]/>
<!HELP[Manual modification of the header may cause parsing problem!]/>
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<!NAME[C:\usr\sap\JTP\JC00\SDM\program\log\sdmcl20080917200328.log]/>
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<!FORMATTER[com.sap.tc.logging.TraceFormatter(%24d %s: %m)]/>
<!ENCODING[Cp1252]/>
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Sep 17, 2008 1:04:45 PM Error: Unable to compare host[Jupiter] and host[pfs] Throwable: java.net.UnknownHostException Throwable message: pfs
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Host:PENITUS15
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HostAddress:192.168.0.215
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State:5
HostAddress:192.168.0.14
Name:JC_Jupiter_JTP_00
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HostAddress:192.168.0.14
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Name:JM_T1221672404781_2_penitus15
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State:5
HostAddress:192.168.0.215
Name:JM_T1221679486171_0_Jupiter
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State:5
HostAddress:192.168.0.14
Name:JC_Jupiter_JTP_00
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Hello,
I installed the WAS testdrive on Linux SUSE 9.3 and the SNDS on WinXP.
I am trying to deploy the welcome application from the SNDS and get the following error message:
SDM could not start the J2ee Cluster on the host nw4host! The online deployment is terminated. JStartup Framework ist not able to deliver an information about the cluster control instances! Please check the status of the J2EE Engine.
I can start the J2EE Start page on port 50000, the system info shows that dispatcher, server0 and SDM are running. I can start the visual admin with go, the SDM with RemoteGui and the DeployTool.
The comand startsap check nw4host shows, everythings running:
nw4host:nw4adm 54> startsap check nw4host
Checking ADA db Database
ABAP Database is running
Checking ADA db Database
J2EE Database is running
See logfile JdbcCon.log
Checking SAP NW4 Instance SCS01
Instance SCS01 is running
Checking SAP NW4 Instance DVEBMGS00
Instance DVEBMGS00 is running
Logging in to SAP with the Java Gui, the ICM says:
ABAP Server operational        = TRUE
J2EE Server configured         = FALSE
J2EE HTTP port                 = 50000
J2EE HTTPS port                = 50001
J2EE Server operational        = TRUE
Default root access handler    = ABAP
URL Prefix Table loaded        = TRUE
Any idea where the problem could be ?
Thanks, Manfred.

changed the ip address for nw4host in etc/hosts to the real ip address of the server where application runs

NW4: SDM could not start the J2EE cluster on the host nw4host

Hello,
in NW4 i get this error when i try to deploy the welcome webdynpro:
SDM could not start the J2EE cluster on the host nw4host! The online deployment is terminated. JStartup Framework is not able to deliver an information about the cluster control instances! Please check the status of the J2EE Engine.
I am using NW4 (built 28.9.04) on Suse 9.0 and the corresponding IDE (2.04) on Windows 2000.
In the J2EE view of the IDE everything (SDM, Dispatcher and Server) is green. I can start the examples on port 50000. According to systeminfo everything is running.
I searched in OSS and found Note 738402. But there is no EOF in the SDM-logfile. And when i started the J2EE-Configtool the value for "admin/host/SID" is not localhost.
Any hints?
Regards,
Nico.

Hello,
> Developer Studio -> Preferences -> SAP J2EE Engine ?
of course. Every icon (SDM, Dispatcher and server) is green in the J22E-View of the IDE. I still get this error message.
Regards,
Nico.

SDM could not start the J2EE cluster on the host Error on Deployments

Hi,
We are sudenly getting this Error when trying to make a Deployment in the NWDE:
Settings
SDM host : 10.26.26.198
SDM port : 50018
URL to deploy : file:/C:/DOCUME1/ALMA1.CAR/LOCALS~1/Temp/temp49346WDWFApp.ear
Result
=> deployment aborted : file:/C:/DOCUME1/ALMA1.CAR/LOCALS~1/Temp/temp49346WDWFApp.ear
Aborted: development component 'WDWFApp'/'local'/'LOKAL'/'0.2007.02.16.15.11.28'/'0':SDM could not start the J2EE cluster on the host vmxtbcsapep01! The online deployment is terminated. There is no clutser control instance running on host vmxtbcsapep01 which is described in SecureStorage . The instances, returned by MessageServer [MS host: vmxtbcsapep01; MS port: 3901], are :|Name:JM_T1171660289517_0_ALMACARVAJAL |Host:miriamdragustinovis |State:5|HostAddress:10.21.69.164||Name:JM_T1171656308064_0_vmxtbcsapep01 |Host:cvespinosa |State:5|HostAddress:10.26.26.198||Name:JC_vmxtbcsapep01_CPQ_00 |Host:cvespinosa |State:5|HostAddress:10.26.26.198|Please check if there is an appropriate running cluster instances. (message ID: com.sap.sdm.serverext.servertype.inqmy.extern.EngineApplOnlineDeployerImpl.performAction(DeploymentActionTypes).STARTUP_CLUSTER)
Deployment exception : The deployment of at least one item aborted
And in the sdm log file we got this kind of errors:
Feb 16, 2007 2:13:46 PM Error: Unable to compare host[vmxtbcsapep01] and host[miriamdragustinovis] Throwable: java.net.UnknownHostException Throwable message: miriamdragustinovis
Feb 16, 2007 2:13:46 PM Error: Unable to compare host[vmxtbcsapep01] and host[cvespinosa] Throwable: java.net.UnknownHostException Throwable message: cvespinosa
Feb 16, 2007 2:13:46 PM Error: Unable to compare host[vmxtbcsapep01] and host[cvespinosa] Throwable: java.net.UnknownHostException Throwable message: cvespinosa
Feb 16, 2007 2:13:46 PM Error: An error occured while starting a cluster instance.
Feb 16, 2007 2:13:46 PM Error: There is no clutser control instance running on host vmxtbcsapep01 which is described in SecureStorage .
The instances, returned by MessageServer [MS host: vmxtbcsapep01; MS port: 3901], are :
Name:JM_T1171656916610_0_ALMACARVAJAL
Host:miriamdragustinovis
State:5
HostAddress:10.21.69.164
Name:JM_T1171656308064_0_vmxtbcsapep01
Host:cvespinosa
State:5
HostAddress:10.26.26.198
Name:JC_vmxtbcsapep01_CPQ_00
Host:cvespinosa
State:5
HostAddress:10.26.26.198
Any Idea what can be wrong? we have even restarted de AIX Server and starting all the services and it is still not working.
Thanx in Advanced!
Gerardo J

Hi Gerardo,
I encountered exactly the same error, but had a different solution as I was expecting from the error-message.
In my case I was forced by the Visual Administrator to change the administration password, since the time was up on it. But as the password for the Visual Administrator is saved within the database, the password for the SDM is stored within the secure store (file-system) and changing the password just in VA will not automatically change it also in the secure store. But since both passwords for the internal usage need to be equalized, I encountered problems afterwards when trying to deploy something and I got the same error message. However the sense of restriction is meant here, the solution on it was rather simple as follows (Just note that you need to enter a dummy-password first, before setting the correct one similar to your visual administrator):
1. create a telnet session to your J2EE using a command line shell
2. enter "jump 0" to get on the correct node within your J2EE
3. enter "add user" to gain access to user-specific commands
4. enter "password <Administrator> <temporarily new password>"
5. exit
6. create another telnet session to your J2EE using a command line shell
7. after succeeded the login, you will now be forced to enter a new password - so enter "password <Administrator> <origin password of the Visual Administrator>"
8. exit
9. now start the config-tool of the engine
10. apply to the DB-default-question with "yes"
11. select the Secure Store on the left
12. select the entry "admin/password/..." that you can see it in the bottom lines.
13. click "Remove" to delete it from the list
14. set the password similar to the Visual Administrator password within the "Value" line (take care as you can not see the digits).
15. click "Add" to add it back to the list
16. click the disc symbol in the top of the UI to save the new password (if you don't get a dialog afterwards that the data has been stored, something may hasn't worked fine when removing/adding the password-entry, in this case repeat the action on it).
17. After exiting the config-tool, you need to restart the entire J2EE.
18. Your hopefully finished by success ;o))
Best regards
Jochen

WLS Cluster Servlet not "sticky" - continuous round robin (WLS 6.1 SP2)

          We have WLS serving as a proxy (with HttpClusterServlet) to a cluster of WLS servers
          running a WebApp with in memory HttpSession replication.
          However, subsequent calls from a browser continue to round robin through the cluster
          instead of returning to the same server.
          We have enable cookies in the browser.
          We have configured replication in the web.xml file.
          Is this an issue with SP2 perhaps?
          thanks in advance,
          -Mark


          We've noticed this as well, see my recent post. It definetly seems to be different
          from WL5.1.
          Sometimes we also see the same HTTPRequest going to BOTH servers in our cluster.
          We were testing with only one browser window and one user, and occasionally both
          clusters process the same request.
          We are using IIS with the proxy plugin and Round Robin. We installed the WL6.1
          verison of the plug in aswell.
          It would be great if you could configure WL6.1 to be sticky where one user sticks
          to one server until failover.
          "Mark" <[email protected]> wrote:
          >
          >We have WLS serving as a proxy (with HttpClusterServlet) to a cluster
          >of WLS servers
          >running a WebApp with in memory HttpSession replication.
          >
          >However, subsequent calls from a browser continue to round robin through
          >the cluster
          >instead of returning to the same server.
          >
          >We have enable cookies in the browser.
          >
          >We have configured replication in the web.xml file.
          >
          >Is this an issue with SP2 perhaps?
          >
          >thanks in advance,
          >-Mark

NSAPI not sticky in a cluster

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