Resubmission of an Instance in IS is not working.

Hi,

We are running on webMethods 8.0 version with IS core fix 27. We are trying to submit an instance by invoking the resubmitInstanceStep service in WmMonitor package by passing the instnace id,instanceiteration,stepid and stepiteration as the inputs. But the resubmission is not working. We have also defined the portal configuration in the monitor.cnf.
When running the service could see the below errors in MWS.

Errors

2013-07-26 17:00:22 EEST (com.webmethods.jms.db.DbJMSClient:TRACE) - Published message: class com.webmethods.portal.event.system.impl.LoginFailedEvent[5518270191574307840:1374847222885]
2013-07-26 17:00:22 EEST (com.webmethods.jms.db.DbJMSClient:DEBUG) - Saving JMS Queue event: com.webmethods.portal.event.system.impl.LoginFailedEvent; ts=1374847222864; vmid=15f29f1189190636:49693dc:140040208ee:-8000; ip=null; jcrsession=null to: 11
2013-07-26 17:00:22 EEST (com.webmethods.jms.db.DbJMSClient:TRACE) - Published message: class com.webmethods.portal.event.system.impl.LoginFailedEvent[4721432294780262400:1374847222873]
2013-07-26 17:00:22 EEST (Framework:DEBUG) - invoking authHandler: ntlm
2013-07-26 17:00:22 EEST (Framework:DEBUG) - invoking authHandler: httpHeader
2013-07-26 17:00:22 EEST (Framework:DEBUG) - invoking authHandler: saml
2013-07-26 17:00:22 EEST (Framework:DEBUG) - invoking authHandler: forms
2013-07-26 17:00:22 EEST (Framework:DEBUG) - invoking authHandler: basic
2013-07-26 17:00:22 EEST (Framework:DEBUG) - calling session validator
2013-07-26 17:00:22 EEST (Framework:DEBUG) - Trying to authenticate user: administrator
2013-07-26 17:00:22 EEST (com.webmethods.jms.db.DbJMSClient:TRACE) - Received message: class com.webmethods.portal.event.system.impl.LoginFailedEvent[4721432294780262400:1374847222873]
2013-07-26 17:00:22 EEST (com.webmethods.jms.db.DbJMSClient:DEBUG) - Saving JMS Queue event: com.webmethods.portal.event.system.impl.LoginFailedEvent; ts=1374847222876; vmid=15f29f1189190636:49693dc:140040208ee:-8000; ip=null; jcrsession=null to: 11
2013-07-26 17:00:22 EEST (Framework:INFO) - Validate::handle() - failed to login
2013-07-26 17:00:22 EEST (com.webmethods.jms.db.DbJMSClient:TRACE) - Published message: class com.webmethods.portal.event.system.impl.LoginFailedEvent[3631231461956719616:1374847222922]
2013-07-26 17:00:22 EEST (com.webmethods.jms.db.DbJMSClient:TRACE) - Published message: class com.webmethods.portal.event.system.impl.LoginFailedEvent[5518270191574307840:1374847222885]
2013-07-26 17:00:22 EEST (Framework:DEBUG) - invoking authHandler: ntlm

Could you please let me know what could be wrong?

/Thanks,
Arun Gopa Kumar.