ConnectionException on creating UDC connection

Hi All

I am on SAP MII 12.2 and while trying to create a UDC connection,I am getting the following error :

Unable to create socket connection

[EXCEPTION]

java.net.ConnectException: Connection refused

at java.net.PlainSocketImpl.socketConnect(Native Method)

Can some one please help with some pointers?

Regards

Shweta