Hello Maxim, I haven't reply earlier because I was testing several ways to setup the "Installation" process of the Cluster.
To answer your questions: 1- I was setting the same OM initial Admin user on both, on the new Installation I created a different user for each node. But on the first time I did created the same user twice, I don't know how but it did. 2- I have only 1 DB for both nodes. Anyhow I will let you here the error that gave me at the final step on the second node, the first one was running without problem the installation process. P.D: I'm able now to enter on the Rooms, the Cluster is working perfectly but I still having the same error at the end of the second node, that's why it took so long to reply, I was testing different entries on all the fields of the Installation but the result is the same. Here is the error: InstalaciĆ³n fallida <openjpa-3.1.2-r66d2a72 fatal store error> org.apache.openjpa.persistence.EntityExistsException: The transaction has been rolled back. See the nested exceptions for details on the errors that occurred. FailedObject: org.apache.openmeetings.db.entity.basic.Configuration@3a53a03b at org.apache.openjpa.kernel.BrokerImpl.newFlushException(BrokerImpl.java:2470) at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:2308) at org.apache.openjpa.kernel.BrokerImpl.flushSafe(BrokerImpl.java:2199) at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:1962) at org.apache.openjpa.kernel.QueryImpl.isInMemory(QueryImpl.java:1028) at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:902) at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:843) at org.apache.openjpa.kernel.DelegatingQuery.execute(DelegatingQuery.java:601) at org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:297) at org.apache.openjpa.persistence.QueryImpl.getResultList(QueryImpl.java:314) at org.apache.openmeetings.db.dao.basic.ConfigurationDao.get(ConfigurationDao.java:129) at org.apache.openmeetings.db.dao.basic.ConfigurationDao.get(ConfigurationDao.java:136) at org.apache.openmeetings.db.dao.basic.ConfigurationDao.getString(ConfigurationDao.java:186) at org.apache.openmeetings.db.dao.basic.ConfigurationDao.reloadCrypt(ConfigurationDao.java:372) at org.apache.openmeetings.db.dao.basic.ConfigurationDao.update(ConfigurationDao.java:257) at org.apache.openmeetings.db.dao.basic.ConfigurationDao.update(ConfigurationDao.java:224) at org.apache.openmeetings.db.dao.basic.ConfigurationDao$$FastClassBySpringCGLIB$$2f9526f2.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:367) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:118) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691) at org.apache.openmeetings.db.dao.basic.ConfigurationDao$$EnhancerBySpringCGLIB$$ecd6b025.update(<generated>) at org.apache.openmeetings.installation.ImportInitvalues.loadConfiguration(ImportInitvalues.java:391) at org.apache.openmeetings.installation.ImportInitvalues.loadSystem(ImportInitvalues.java:581) at org.apache.openmeetings.installation.ImportInitvalues.loadAll(ImportInitvalues.java:591) at org.apache.openmeetings.installation.Wicket_Proxy_ImportInitvalues$$FastClassByCGLIB$$14cc0e15.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) at org.apache.wicket.proxy.LazyInitProxyFactory$AbstractCGLibInterceptor.intercept(LazyInitProxyFactory.java:364) at org.apache.openmeetings.installation.Wicket_Proxy_ImportInitvalues$$EnhancerByCGLIB$$5e6b109.loadAll(<generated>) at org.apache.openmeetings.web.pages.install.InstallWizard$InstallProcess.run(InstallWizard.java:833) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: <openjpa-3.1.2-r66d2a72 fatal store error> org.apache.openjpa.persistence.EntityExistsException: Duplicate entry ' crypt.class.name' for key 'U_CNFGRTN_OM_KEY' {prepstmnt 313424765 INSERT INTO configuration (deleted, inserted, updated, comment, fromVersion, om_key, type, value, user_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)} [code=1062, state=23000] FailedObject: org.apache.openmeetings.db.entity.basic.Configuration@3a53a03b at org.apache.openjpa.jdbc.sql.DBDictionary.narrow(DBDictionary.java:5263) at org.apache.openjpa.jdbc.sql.DBDictionary.newStoreException(DBDictionary.java:5238) at org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:134) at org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:75) at org.apache.openjpa.jdbc.kernel.PreparedStatementManagerImpl.flushAndUpdate(PreparedStatementManagerImpl.java:146) at org.apache.openjpa.jdbc.kernel.BatchingPreparedStatementManagerImpl.flushAndUpdate(BatchingPreparedStatementManagerImpl.java:80) at org.apache.openjpa.jdbc.kernel.PreparedStatementManagerImpl.flushInternal(PreparedStatementManagerImpl.java:102) at org.apache.openjpa.jdbc.kernel.PreparedStatementManagerImpl.flush(PreparedStatementManagerImpl.java:90) at org.apache.openjpa.jdbc.kernel.ConstraintUpdateManager.flush(ConstraintUpdateManager.java:554) at org.apache.openjpa.jdbc.kernel.ConstraintUpdateManager.flush(ConstraintUpdateManager.java:110) at org.apache.openjpa.jdbc.kernel.BatchingConstraintUpdateManager.flush(BatchingConstraintUpdateManager.java:61) at org.apache.openjpa.jdbc.kernel.AbstractUpdateManager.flush(AbstractUpdateManager.java:108) at org.apache.openjpa.jdbc.kernel.AbstractUpdateManager.flush(AbstractUpdateManager.java:81) at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.flush(JDBCStoreManager.java:757) at org.apache.openjpa.kernel.DelegatingStoreManager.flush(DelegatingStoreManager.java:146) at org.apache.openjpa.datacache.DataCacheStoreManager.flush(DataCacheStoreManager.java:679) at org.apache.openjpa.kernel.DelegatingStoreManager.flush(DelegatingStoreManager.java:146) ... 35 more Caused by: org.apache.openjpa.lib.jdbc.ReportingSQLException: Duplicate entry 'crypt.class.name' for key 'U_CNFGRTN_OM_KEY' {prepstmnt 313424765 INSERT INTO configuration (deleted, inserted, updated, comment, fromVersion, om_key, type, value, user_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)} [code=1062, state=23000] at org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator.wrap(LoggingConnectionDecorator.java:219) at org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator.wrap(LoggingConnectionDecorator.java:195) at org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator.access$1000(LoggingConnectionDecorator.java:58) at org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator$LoggingConnection$LoggingPreparedStatement.executeUpdate(LoggingConnectionDecorator.java:1188) at org.apache.openjpa.lib.jdbc.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:308) at org.apache.openjpa.lib.jdbc.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:308) at org.apache.openjpa.jdbc.kernel.PreparedStatementManagerImpl.executeUpdate(PreparedStatementManagerImpl.java:271) at org.apache.openjpa.jdbc.kernel.PreparedStatementManagerImpl.flushAndUpdate(PreparedStatementManagerImpl.java:121) ... 47 more Greetings and have a nice day, Jibsan