A connection to the server could not be established: null (user=DBA.ADMIN)

This morning I got a call from various people complaining about OTM not allowing them to login. Anyone who tried logging in got this error:

A connection to the server could not be established: null (user=any_valid_otm_user)

I checked $GLOG_HOME/logs/weblogic/console.log.0:


INFO | 2011/12/14 09:40:07 | -- OTM Event: serverReady
INFO | 2011/12/14 09:47:01 | javax.management.MBeanException: MBean invoke failed: weblogic.management.mbeanservers.edit.EditTimedOutException:
INFO | 2011/12/14 09:47:01 |
INFO | 2011/12/14 09:47:01 | javax.management.MBeanException: MBean invoke failed: weblogic.management.mbeanservers.edit.EditTimedOutException:
INFO | 2011/12/14 09:47:01 | at weblogic.rmi.internal.ServerRequest.sendReceive(ServerRequest.java:205)
INFO | 2011/12/14 09:47:01 | at weblogic.rmi.internal.BasicRemoteRef.invoke(BasicRemoteRef.java:222)
INFO | 2011/12/14 09:47:01 | at javax.management.remote.rmi.RMIConnectionImpl_1033_WLStub.invoke(Unknown Source)
INFO | 2011/12/14 09:47:01 | at weblogic.management.remote.common.RMIConnectionWrapper$16.run(ClientProviderBase.java:876)
INFO | 2011/12/14 09:47:01 | at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)
INFO | 2011/12/14 09:47:01 | at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:147)
INFO | 2011/12/14 09:47:01 | at weblogic.security.Security.runAs(Security.java:61)
INFO | 2011/12/14 09:47:01 | at weblogic.management.remote.common.RMIConnectionWrapper.invoke(ClientProviderBase.java:874)
INFO | 2011/12/14 09:47:01 | at javax.management.remote.rmi.RMIConnector$RemoteMBeanServerConnection.invoke(RMIConnector.java:993)
INFO | 2011/12/14 09:47:01 | at glog.util.jmx.JMXConnection.call(JMXConnection.java:104)
INFO | 2011/12/14 09:47:01 | at glog.util.j2ee.remote.WLManagementHelper$Edit.(WLManagementHelper.java:54)
INFO | 2011/12/14 09:47:01 | at glog.util.j2ee.jdbc.WLConnectionPoolInstance.create(WLConnectionPoolInstance.java:139)
INFO | 2011/12/14 09:47:01 | at glog.util.j2ee.jdbc.ASConnectionPoolInstance.(ASConnectionPoolInstance.java:52)
INFO | 2011/12/14 09:47:01 | at glog.util.datasource.AppServerConnectionPoolInstance.(AppServerConnectionPoolInstance.java:9)
INFO | 2011/12/14 09:47:01 | at glog.util.datasource.AppServerConnectionPool.getNewInstance(AppServerConnectionPool.java:71)
INFO | 2011/12/14 09:47:01 | at glog.util.datasource.AppServerConnectionPool.getInstance(AppServerConnectionPool.java:61)
INFO | 2011/12/14 09:47:01 | at glog.util.datasource.AppServerConnectionPool.reserve(AppServerConnectionPool.java:34)
INFO | 2011/12/14 09:47:01 | at glog.util.datasource.DataSource.reserve(DataSource.java:143)
INFO | 2011/12/14 09:47:01 | at glog.util.datasource.DataSource.reserve(DataSource.java:137)
INFO | 2011/12/14 09:47:01 | at glog.util.jdbc.noserver.T2SharedConnection$ReferencedConnection.addRef(T2SharedConnection.java:301)
INFO | 2011/12/14 09:47:01 | at glog.util.jdbc.noserver.T2SharedConnection$ReferencedConnection.addRef(T2SharedConnection.java:291)
INFO | 2011/12/14 09:47:01 | at glog.util.jdbc.noserver.T2SharedConnection.open(T2SharedConnection.java:57)
INFO | 2011/12/14 09:47:01 | at glog.server.useraccess.UserAccessSessionBean.getUserAccess(UserAccessSessionBean.java:154)
INFO | 2011/12/14 09:47:01 | at glog.server.useraccess.UserAccessSessionServerSideEJBWrapper.getUserAccess(UserAccessSessionServerSideEJBWrapper.java:87)
INFO | 2011/12/14 09:47:01 | at glog.server.useraccess.UserAccessSessionHome_uzvgzz_EOImpl.getUserAccess(UserAccessSessionHome_uzvgzz_EOImpl.java:1600)
INFO | 2011/12/14 09:47:01 | at glog.server.useraccess.UserAccessSessionHome_uzvgzz_EOImpl_WLSkel.invoke(Unknown Source)
INFO | 2011/12/14 09:47:01 | at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:589)
INFO | 2011/12/14 09:47:01 | at weblogic.rmi.cluster.ClusterableServerRef.invoke(ClusterableServerRef.java:230)
INFO | 2011/12/14 09:47:01 | at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:477)
INFO | 2011/12/14 09:47:01 | at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)
INFO | 2011/12/14 09:47:01 | at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:147)
INFO | 2011/12/14 09:47:01 | at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:473)
INFO | 2011/12/14 09:47:01 | at weblogic.rmi.internal.wls.WLSExecuteRequest.run(WLSExecuteRequest.java:118)
INFO | 2011/12/14 09:47:01 | at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
INFO | 2011/12/14 09:47:01 | at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

I googled and found a few hits and in one of them found this line:

When I'm trying to deploy my project on weblogic I've got this error:
2007-02-09 16:05:15 CET Error Deployer BEA-149181 Deployment Service encountered error while aborting the edit session before start. Initiato
r for this edit session is 'principals=[kernel identity = -1632281053]'. Error is 'weblogic.management.provider.EditNotEditorException: Not edit lock
owner'
weblogic.management.provider.EditNotEditorException: Not edit lock owner

On seeing those words: Not edit lock owner, I realized that the previous day, I was trying to create SFTP File control in OTM Weblogic console. It wasn't letting me create a new one, till I clicked Lock and Edit. So I quickly logged into weblogic console and clicked on Release Configuration button. The subsequent logins to OTM started working after this.