I am trying to create a service level agreement based grid scheduling. For that I am using wsag4j application server. I am using tomcat 5.3.35 as my container and Eclipse SDK 3.5.2 as client API. My deployed web services is running perfactly. But when I am trying to run a client program. I got following problem 2012-04-08 16:11:58,715 INFO - Deploying module: addressing-1.5.4 - file:/home/guser01/project/SLA_scheduling_program/resources/axis2-client/modules/addressing-1.5.4.mar 2012-04-08 16:11:58,744 INFO - Deploying module: rampart-1.5.1 - file:/home/guser01/project/SLA_scheduling_program/resources/axis2-client/modules/rampart-1.5.1.mar 2012-04-08 16:11:58,766 INFO - Deploying module: rahas-1.5.1 - file:/home/guser01/project/SLA_scheduling_program/resources/axis2-client/modules/rahas-1.5.1.mar 2012-04-08 16:11:59,752 ERROR - WSDoAllReceiver: security processing failed Exception in thread "main" org.ogf.graap.wsag.api.exceptions.ResourceUnavailableException: org.apache.muse.ws.addressing.soap.SoapFault: WSDoAllReceiver: security processing failed at org.ogf.graap.wsag.client.remote.RemoteAgreementFactoryRegistryServiceImpl.listAgreementFactories(RemoteAgreementFactoryRegistryServiceImpl.java:129) at sla_scheduling_application.client.main(client.java:74) Caused by: org.apache.muse.ws.addressing.soap.SoapFault: WSDoAllReceiver: security processing failed at org.apache.muse.core.AbstractResourceClient.invoke(AbstractResourceClient.java:298) at org.apache.muse.core.AbstractResourceClient.invoke(AbstractResourceClient.java:254) at org.apache.muse.ws.resource.remote.WsResourceClient.getResourceProperty(WsResourceClient.java:138) at org.ogf.graap.wsag.client.remote.WsrfResourceClient.getResourceProperty(WsrfResourceClient.java:318) at org.ogf.graap.wsag.client.remote.RemoteAgreementFactoryRegistryServiceImpl.listAgreementFactories(RemoteAgreementFactoryRegistryServiceImpl.java:103) ... 1 more catalina.out shows the following... .................. .................. 2012-04-08 16:21:56,685 ERROR - WSDoAllReceiver: security processing failed org.apache.axis2.AxisFault: WSDoAllReceiver: security processing failed at org.apache.rampart.handler.WSDoAllReceiver.processBasic(WSDoAllReceiver.java:214) .......................................................... ......................................................... Caused by: org.apache.ws.security.WSSecurityException: The signature or decryption was invalid (The provided certificate is invalid); nested exception is: java.security.cert.CertificateExpiredException: NotAfter: Fri Apr 06 17:10:27 IST 2012 at org.apache.ws.security.processor.SignatureProcessor.verifyXMLSignature(SignatureProcessor.java:438) ............................................... ................................................ Caused by: java.security.cert.CertificateExpiredException: NotAfter: Fri Apr 06 17:10:27 IST 2012 at sun.security.x509.CertificateValidity.valid(CertificateValidity.java:256) at sun.security.x509.X509CertImpl.checkValidity(X509CertImpl.java:570) ......................................................... ......................................................... I can't understand any thing. Can anyone help me please?.