Your devices (COOK_1, COOK_2, SCALDERS) are refusing the connection. This is happening at a basic TCP level. There’s not much more I can tell you, nothing is wrong on the Ignition side.
Perhaps the devices have a limit on the number of incoming connections they can receive or are configured wrong; you’ll have to consult your documentation on those devices.
INFO | jvm 1 | 2012/05/31 09:49:01 | ERROR [COOK_2 ] [09:49:01,531]: [COOK_2] Connect Error.
INFO | jvm 1 | 2012/05/31 09:49:01 | java.net.ConnectException: Connection refused: connect
INFO | jvm 1 | 2012/05/31 09:49:01 | at java.net.PlainSocketImpl.socketConnect(Native Method)
INFO | jvm 1 | 2012/05/31 09:49:01 | at java.net.PlainSocketImpl.doConnect(Unknown Source)
INFO | jvm 1 | 2012/05/31 09:49:01 | at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
INFO | jvm 1 | 2012/05/31 09:49:01 | at java.net.PlainSocketImpl.connect(Unknown Source)
INFO | jvm 1 | 2012/05/31 09:49:01 | at java.net.SocksSocketImpl.connect(Unknown Source)