求助，weblogic受控服务启动报错

<2012-5-22 下午04时29分18秒 CST> <Error> <Security> <BEA-090870> <The realm "myrealm" failed to be loaded: weblogic.security.service.SecurityServiceException: com.bea.common.engine.ServiceInitializationException: weblogic.security.spi.ProviderInitializationException: [Security:090730]Failed to verify credential mapper LDAP hierarchy
netscape.ldap.LDAPException: failed to connect to server ldap://localhost:7001 (91)
        at netscape.ldap.LDAPConnSetupMgr.connectServer(LDAPConnSetupMgr.java:515)
        at netscape.ldap.LDAPConnSetupMgr.openSerial(LDAPConnSetupMgr.java:435)
        at netscape.ldap.LDAPConnSetupMgr.connect(LDAPConnSetupMgr.java:274)
        at netscape.ldap.LDAPConnSetupMgr.openConnection(LDAPConnSetupMgr.java:199)
        at netscape.ldap.LDAPConnThread.connect(LDAPConnThread.java:109)
        at netscape.ldap.LDAPConnection.connect(LDAPConnection.java:1083)
        at netscape.ldap.LDAPConnection.connect(LDAPConnection.java:954)
        at netscape.ldap.LDAPConnection.connect(LDAPConnection.java:781)
        at weblogic.ldap.EmbeddedLDAPConnection.getAndInitDelegate(EmbeddedLDAPConnection.java:2037)
        at weblogic.ldap.EmbeddedLDAPConnection.add(EmbeddedLDAPConnection.java:1065)
        at weblogic.security.providers.credentials.DefaultCredentialMapperLDAPHelper.addEntry(DefaultCredentialMapperLDAPHelper.java:537)
        at weblogic.security.providers.credentials.DefaultCredentialMapperLDAPHelper.createOrgUnit(DefaultCredentialMapperLDAPHelper.java:432)
        at weblogic.security.providers.credentials.DefaultCredentialMapperLDAPHelper.verifyHierarchy(DefaultCredentialMapperLDAPHelper.java:407)
        at weblogic.security.providers.credentials.DefaultCredentialMapperLDAPHelper.<init>(DefaultCredentialMapperLDAPHelper.java:146)
        at weblogic.security.providers.credentials.DefaultCredentialMapperLDAPHelper.getInstance(DefaultCredentialMapperLDAPHelper.java:112)
        at weblogic.security.providers.credentials.DefaultCredentialMapperProviderImpl.initialize(DefaultCredentialMapperProviderImpl.java:93)