来这里，在尝试了这么多次之后。

使用案例：我们正在尝试从另一个具有RDS IAM身份验证令牌的AWS帐户连接到RDS DB Insance。能够在配置所有必要的要求后连接到数据库。(创建数据库用户，设置该用户的所有权限，附加策略)工作很好(只有JDBC url)。

但接下来，当我尝试添加带有C3P0轮询策略和相同RDS令牌方法策略的Hibernate配置时。我得到了一个例外

PAM authentication failed for user "<username>"

我试了很多方法，但都不管用。
有人能帮我解释一下我在这里错过的东西吗？或者，此错误的可能性是什么？只是用户和密码配置错误还是其他原因？
注：我们使用的是ECS Fargate应用程序。而且，同样的问题对我也没有帮助：psql: FATAL: PAM authentication failed for user，这就是为什么用usecase提出这个问题。

Connection error: 
org.postgresql.util.PSQLException: FATAL: PAM authentication failed for user "<username>"
    at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:613) ~[postgresql-42.2.16.jar:42.2.16]
    at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:161) ~[postgresql-42.2.16.jar:42.2.16]
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:213) ~[postgresql-42.2.16.jar:42.2.16]
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:51) ~[postgresql-42.2.16.jar:42.2.16]
    at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:225) ~[postgresql-42.2.16.jar:42.2.16]
    at org.postgresql.Driver.makeConnection(Driver.java:465) ~[postgresql-42.2.16.jar:42.2.16]
    at org.postgresql.Driver.connect(Driver.java:264) ~[postgresql-42.2.16.jar:42.2.16]
    at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175) ~[c3p0-0.9.5.5.jar:0.9.5.5]
    at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220) ~[c3p0-0.9.5.5.jar:0.9.5.5]
    at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206) ~[c3p0-0.9.5.5.jar:0.9.5.5]
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203) ~[c3p0-0.9.5.5.jar:0.9.5.5]
    at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1176) ~[c3p0-0.9.5.5.jar:0.9.5.5]
    at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1163) ~[c3p0-0.9.5.5.jar:0.9.5.5]
    at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44) ~[c3p0-0.9.5.5.jar:0.9.5.5]
    at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1908) ~[c3p0-0.9.5.5.jar:0.9.5.5]
    at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696) ~[mchange-commons-java-0.2.19.jar:0.2.19]