Error on Websphere Server for connection refused

See more:

Java

I have installed WebSphere 8 on my local machine and deploy application on that server.
Application have data source. Application uses AS400 DB2 i-series database.

While running the application I got following error,

SystemOut O java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:383)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:245)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:232)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:377)
at java.net.Socket.connect(Socket.java:539)
at java.net.Socket.connect(Socket.java:488)
at java.net.Socket.(Socket.java:385)
at java.net.Socket.(Socket.java:199)
at com.ibm.as400.access.PortMapper.getServerSocket(PortMapper.java:151)
at com.ibm.as400.access.AS400ImplRemote.signonConnect(AS400ImplRemote.java:1946)
at com.ibm.as400.access.AS400ImplRemote.signon(AS400ImplRemote.java:1846)
at com.ibm.as400.access.AS400.sendSignonRequest(AS400.java:2576)
at com.ibm.as400.access.AS400.promptSignon(AS400.java:2147)
at com.ibm.as400.access.AS400.signon(AS400.java:3417)
at com.ibm.as400.access.AS400.validateSignon(AS400.java:3635)
at com.ibm.as400.access.AS400.validateSignon(AS400.java:3605)
at com.ibm.as400.access.AS400.authenticate(AS400.java:680)

Can any one please suggest solution for above error?