We have ambari cluster we have issue with ambari server example ambari-server start Using python /usr/bin/python Starting ambari-server Ambari Server running with administrator privileges.Organizing resource files at /var/lib/ambari-server/resources...Ambari database consistency check started...Server PID at: /var/run/ambari-server/ambari-server.pid Server out at: /var/log/ambari-server/ambari-server.out Server log at: /var/log/ambari-server/ambari-server.log Waiting for server start............................................................ERROR: Exiting with exit code 1.REASON: Server not yet listening on http port 8080 after 50 seconds. Exiting. ambari server create the PID and service is up but server not listening on port 8080 we check the firewall and iptables but this services are down we check the PostgreSQL service ( is running well ) systemctl status postgresql.service● postgresql.service - PostgreSQL database server Loaded: loaded (/usr/lib/systemd/system/postgresql.service; enabled; vendor preset: disabled) Active: active (running) since Thu 2020-01-30 12:49:26 UTC; 20min ago we also checked the following cat /etc/ambari-server/conf/password.dat bigdata grep 'ambari' /var/lib/pgsql/data/pg_hba.conf local all ambari,mapred md5 host all ambari,mapred 0.0.0.0/0 md5 host all ambari,mapred ::/0 md5 grep 'jdbc' /etc/ambari-server/conf/ambari.properties custom.postgres.jdbc.name=postgresql-jdbc.jar previous.custom.postgres.jdbc.name=postgresql-jdbc.jar server.jdbc.connection-pool=internal server.jdbc.database=postgres server.jdbc.database_name=ambari server.jdbc.postgres.schema=ambari server.jdbc.user.name=ambari but seems they are ok so what could be the reason that the default port 8080 of ambari server isn’t opened 30 Jan 2020 12:51:50,152 ERROR [main] DBAccessorImpl:119 - Error while creating database accessor org.postgresql.util.PSQLException: Connection refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections. at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:207) at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:64) at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:138) at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:29) at org.postgresql.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:21) at org.postgresql.jdbc4.AbstractJdbc4Connection.<init>(AbstractJdbc4Connection.java:31) at org.postgresql.jdbc4.Jdbc4Connection.<init>(Jdbc4Connection.java:24) at org.postgresql.Driver.makeConnection(Driver.java:410) at org.postgresql.Driver.connect(Driver.java:280) at java.sql.DriverManager.getConnection(DriverManager.java:664) at java.sql.DriverManager.getConnection(DriverManager.java:247) at org.apache.ambari.server.orm.DBAccessorImpl.<init>(DBAccessorImpl.java:93) at org.apache.ambari.server.orm.DBAccessorImpl$$FastClassByGuice$$86dbc63e.newInstance(<generated>) at com.google.inject.internal.cglib.reflect.$FastConstructor.newInstance(FastConstructor.java:40) at com.google.inject.internal.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:60) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:85) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031) at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40) at com.google.inject.Scopes$1$1.get(Scopes.java:65) at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40) at com.google.inject.internal.FactoryProxy.get(FactoryProxy.java:54) at com.google.inject.internal.SingleFieldInjector.inject(SingleFieldInjector.java:53) at com.google.inject.internal.MembersInjectorImpl.injectMembers(MembersInjectorImpl.java:110) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:94) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031) at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40) at com.google.inject.Scopes$1$1.get(Scopes.java:65) at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40) at com.google.inject.internal.SingleFieldInjector.inject(SingleFieldInjector.java:53) at com.google.inject.internal.MembersInjectorImpl.injectMembers(MembersInjectorImpl.java:110) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:94) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031) at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40) at com.google.inject.Scopes$1$1.get(Scopes.java:65) at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40) at com.google.inject.internal.SingleFieldInjector.inject(SingleFieldInjector.java:53) at com.google.inject.internal.InjectionRequestProcessor$StaticInjection$1.call(InjectionRequestProcessor.java:116) at com.google.inject.internal.InjectionRequestProcessor$StaticInjection$1.call(InjectionRequestProcessor.java:110) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1024) at com.google.inject.internal.InjectionRequestProcessor$StaticInjection.injectMembers(InjectionRequestProcessor.java:110) at com.google.inject.internal.InjectionRequestProcessor.injectMembers(InjectionRequestProcessor.java:78) at com.google.inject.internal.InternalInjectorCreator.injectDynamically(InternalInjectorCreator.java:170) at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:109) at com.google.inject.Guice.createInjector(Guice.java:95) at com.google.inject.Guice.createInjector(Guice.java:72) at com.google.inject.Guice.createInjector(Guice.java:62) at org.apache.ambari.server.controller.AmbariServer.main(AmbariServer.java:1045)Caused by: java.net.ConnectException: Connection timed out (Connection timed out) at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) 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 org.postgresql.core.PGStream.<init>(PGStream.java:60) at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:101) ... 52 more   ... 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