application requester cannot establish the connection. (Connection refused (Connection refused))

[richiecoy]

I am trying to monitor an iseries and I am receiving an exception error on some of the monitors, but not all.

When I try ASPUsage I get:
Exception - com.ibm.as400.access.ConnectionPoolException: The application requester cannot establish the connection. (Connection refused (Connection refused))
com.ibm.as400.access.AS400JDBCConnectionPool.fill(AS400JDBCConnectionPool.java:360)
com.ibm.as400.access.AS400JDBCConnectionPool.getPooledConnection(AS400JDBCConnectionPool.java:501)
com.ibm.as400.access.AS400JDBCConnectionPool.getConnection(AS400JDBCConnectionPool.java:456)
com.ibm.nagios.util.JDBCConnection.getJDBCConnection(JDBCConnection.java:56)
com.ibm.nagios.service.impl.ASPUsage.execute)ASPUsage.java:39)
com.ibm.nagios.client.CheckIBMiStatus.main(CheckIBMiStatus.java:77)

However, If I try BasicInfo - it works and I get a response back.

[zhangyan101]

Plugin takes advantage of JTOpen toolbox to connect to IBM i system. It requires the following ports to be enabled.
http: 449,446,8470,8471,8472,8473,8474,8475,8476
https: 448,9470,9471,9472,9473,9474,9475,9476