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    Expert tip

    Check if you don't have a VPN or something like this messing with your connection. Also, check Jenkins DNS configurations (try to start it with "--dns 8.8.8.8".

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java.net.UnknownHostException: NAME_TWO	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)	at java.net.Socket.connect(Socket.java:589)	at java.net.Socket.connect(Socket.java:538)	at java.net.Socket.(Socket.java:434)	at java.net.Socket.(Socket.java:211)	at org.postgresql.core.PGStream.(PGStream.java:60)	at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:74)	at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:64)	at org.postgresql.jdbc2.AbstractJdbc2Connection.(AbstractJdbc2Connection.java:123)	at org.postgresql.jdbc3.AbstractJdbc3Connection.(AbstractJdbc3Connection.java:28)	at org.postgresql.jdbc3g.AbstractJdbc3gConnection.(AbstractJdbc3gConnection.java:20)	at org.postgresql.jdbc4.AbstractJdbc4Connection.(AbstractJdbc4Connection.java:30)	at org.postgresql.jdbc4.Jdbc4Connection.(Jdbc4Connection.java:22)	at org.postgresql.Driver.makeConnection(Driver.java:391)	at org.postgresql.Driver.connect(Driver.java:265)	at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.getLocalManagedConnection(LocalManagedConnectionFactory.java:328)	at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:304)	at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.createConnectionEventListener(SemaphoreArrayListManagedConnectionPool.java:834)	at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.getConnection(SemaphoreArrayListManagedConnectionPool.java:379)	at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getSimpleConnection(AbstractPool.java:453)	at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getConnection(AbstractPool.java:425)	at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:354)	at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:368)	at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:510)	at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:143)	at org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider.getConnection(InjectedDataSourceConnectionProvider.java:70)	at org.hibernate.engine.jdbc.internal.JdbcServicesImpl$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcServicesImpl.java:242)	at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:117)	at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:85)	at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:184)	at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:156)	at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1827)	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1785)	at org.hibernate.ejb.EntityManagerFactoryImpl.(EntityManagerFactoryImpl.java:96)	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:915)	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:900)	at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:76)	at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.createContainerEntityManagerFactory(PersistenceUnitServiceImpl.java:200)	at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.access$600(PersistenceUnitServiceImpl.java:57)	at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1.run(PersistenceUnitServiceImpl.java:99)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)	at org.jboss.threads.JBossThread.run(JBossThread.java:122)