Background
I wanted to access Postgres from a remote machine. When I tried to connect to Postgres given connection information as :5432/ I got a connection refuse. In order to fix it I followed below steps.
1. Opened postgresql.conf file.
2. modified 'listen_address' to access all ip addresses (listen_addresses = '*')
3. Restarted Postgres server.
Then when I tried to connect to Postgres database from my application on the remote machine I got below error.
Error
[2017-04-21 05:33:25,799] ERROR - Driver Connection error:
org.postgresql.util.PSQLException: FATAL: no pg_hba.conf entry for host "192.168.48.111", user "root", database "apim210_reg", SSL off
at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:438)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:222)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
at org.postgresql.jdbc.PgConnection.(PgConnection.java:194)
at org.postgresql.Driver.makeConnection(Driver.java:431)
at org.postgresql.Driver.connect(Driver.java:247)
at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:278)
at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182)
at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:701)
at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:635)
at org.apache.tomcat.jdbc.pool.ConnectionPool.getConnection(ConnectionPool.java:188)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:127)
at org.wso2.carbon.user.core.util.DatabaseUtil.getDBConnection(DatabaseUtil.java:565)
at org.wso2.carbon.user.core.util.UserCoreUtil.isExistingDomain(UserCoreUtil.java:973)
at org.wso2.carbon.user.core.util.UserCoreUtil.persistDomain(UserCoreUtil.java:827)
at org.wso2.carbon.user.core.common.AbstractUserStoreManager.persistDomain(AbstractUserStoreManager.java:4064)
at org.wso2.carbon.user.core.jdbc.JDBCUserStoreManager.(JDBCUserStoreManager.java:280)
at org.wso2.carbon.user.core.jdbc.JDBCUserStoreManager.(JDBCUserStoreManager.java:222)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.wso2.carbon.user.core.common.DefaultRealm.createObjectWithOptions(DefaultRealm.java:355)
at org.wso2.carbon.user.core.common.DefaultRealm.initializeObjects(DefaultRealm.java:222)
at org.wso2.carbon.user.core.common.DefaultRealm.init(DefaultRealm.java:127)
at org.wso2.carbon.user.core.common.DefaultRealmService.initializeRealm(DefaultRealmService.java:263)
at org.wso2.carbon.user.core.common.DefaultRealmService.(DefaultRealmService.java:100)
at org.wso2.carbon.user.core.common.DefaultRealmService.(DefaultRealmService.java:113)
at org.wso2.carbon.user.core.internal.Activator.startDeploy(Activator.java:68)
at org.wso2.carbon.user.core.internal.BundleCheckActivator.start(BundleCheckActivator.java:61)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:390)
at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1176)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:559)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:544)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:457)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:243)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:438)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:1)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)
Fix
1. Open 'pg_hba.conf' file. (In this file you can define how the access should be given to databases
for particular database users etc)
2. Add below entry in order to allow all IP'S and all usernames to connect to all databases and save.
host all all 0.0.0.0/0 md5
3. Login as postgres user
E.g
$ sudo -i -u postgres
4. Restart Postgres server
E.g
$ /etc/init.d/postgresql restart
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