1977612 - AS Java system cannot start due to LDAP data source access error

While trying to start the AS Java but the system still cannot start. In the trace files see the following exception messages:

• defaultTrace.X.trc:
  com.sap.security.core.persistence##com.sap.security.core.persistence.[cf
  =com.sap.security.core.persistence.datasource.imp.LDAPConnectionManager]
  [md=openNewConnectionPool][cl=27066]#######SAPEngine_System_Thread[impl:
  5]_56##0#0#Error##Plain###Initialisation of connection pool failed for
  USER
  Server not available, please check configuration and availability of
  directory server, switching to a default directory server.
   poolname <LDAP IP>:389_USER
   java.naming.factory.initial= com.sun.jndi.ldap.LdapCtxFactory
   java.naming.security.principal= <domain and server>
   com.sun.jndi.ldap.connect.timeout= 25000
   java.naming.ldap.version= 3
   com.sun.jndi.ldap.read.timeout= 15000
   connection_pool_name= <LDAP IP>:389_USER
   java.naming.provider.url= ldap://<LDAP IP>:389/<DC=domain,DC=...>
   java.naming.security.authentication= simple
   java.naming.security.credentials= ******
   [EXCEPTION: No connection to the ldap server]#

  com.sap.security.core.persistence.datasource.imp.LDAPDataSourceConnectio
  nPool##com.sap.security.core.persistence.datasource.imp.LDAPDataSourceCo
  nnectionPool.newConnection#######SAPEngine_System_Thread[impl:5]_56##0#0
  #Error##Java###no connection to the ldap server
  [EXCEPTION]
   {0}#1#java.security.PrivilegedActionException:
  javax.naming.AuthenticationException: [LDAP: error code 49 - 80090308:
  LdapErr: DSID-0C0903A8, comment: AcceptSecurityContext error, data 532,
   v1db1 ]

• std_serverX.out:
  service com.sap.security.core.ume.service ================= ERROR =================
  Core service com.sap.security.core.ume.service failed. J2EE Engine cannot be started.
  com.sap.engine.frame.ServiceException: Start of UME service failed. Check help topic "Start of UME Service Failed". Technical details: Initialisation of connection pool failed for USER
   poolname <LDAP IP>:389_USER
   [EXCEPTION: no connection to any server possible]
   at com.sap.security.core.server.ume.service.UMEServiceFrame.start(UMEServiceFrame.java:398)
   at com.sap.engine.frame.ApplicationFrameAdaptor.start(ApplicationFrameAdaptor.java:31)
   at com.sap.engine.core.service630.container.ServiceRunner.startApplicationServiceFrame(ServiceRunner.java:214)
   at com.sap.engine.core.service630.container.ServiceRunner.run(ServiceRunner.java:144)
   at com.sap.engine.frame.core.thread.Task.run(Task.java:64)
   at com.sap.engine.core.thread.impl5.SingleThread.execute(SingleThread.java:83)
   at com.sap.engine.core.thread.impl5.SingleThread.run(SingleThread.java:156)
  Caused by: com.sap.security.core.persistence.datasource.PersistenceException: Initialisation of connection pool failed for USER
   poolname <LDAP IP>:389_USER
   [EXCEPTION: no connection to any server possible]

• server.X.log:
  com.sap.security.core.persistence [SAPEngine_System_Thread[impl:5]_15] Fatal: Please recheck the LDAP configuration Initialisation of connection pool failed for UACC
  poolname <LDAP hostname>:389_UACC
  java.naming.provider.url= ldap://<LDAP IP>:389/<your LDAP domain>
  java.naming.factory.initial= com.sun.jndi.ldap.LdapCtxFactory
  java.naming.ldap.version= 3
  com.sun.jndi.ldap.connect.timeout= 25000
  connection_pool_name= <your LDAP hostname>:389_UACC
  java.naming.security.authentication= simple
  [EXCEPTION: No connection to the ldap server]
  com.sap.engine.core.Framework [SAPEngine_System_
  Thread[impl:5]_15] Fatal: Critical shutdown was invoked. Reason is: Core service com.sap.security.core.ume.service failed. J2EE Engine cannot be started.

SAP Netweaver Application Server Java

LDAP, datasource, start up, startup, connection, persistence, pool,No connection to the ldap server, error code 49, Initialisation of connection pool failed for USER poolname.   , KBA , BC-JAS-SEC-UME , User Management Engine , Problem