"invalid type code: 30" encountered when connecting from client app to MetaMatrix Server

Error establishing socket to host and port: mmxserverhost.com:31000. Reason: invalid type code: 30

ERROR   [com.metamatrix.jdbc.transport.SocketTransportHandler]  SocketServerInstance    Failed to connect to HostInfo:  hostName:  mmxserverhost.com portNumber:  31000 inetAddress: mmxserverhost.com/192.168.1.1 ssl:  false clusterName:  DEFAULT_CLUSTER_207196874 on try [3]. Maximum number of retries reached.
java.io.StreamCorruptedException: invalid type code: 30
       at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1356)
       at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1642)
       at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323)
       at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
       at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
       at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
       at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
       at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
       at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
       at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
       at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
       at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
       at com.metamatrix.common.comm.platform.socket.client.SocketServerInstanceImpl.handshake(SocketServerInstanceImpl.java:180)
       at com.metamatrix.common.comm.platform.socket.ObjectSocketImpl.initialize(ObjectSocketImpl.java:70)
       at com.metamatrix.common.comm.platform.socket.ObjectSocketFactoryImpl.createObjectSocket(ObjectSocketFactoryImpl.java:47)
       at com.metamatrix.common.comm.platform.socket.client.SocketServerInstanceImpl.<init>(SocketServerInstanceImpl.java:132)
       at com.metamatrix.common.comm.platform.socket.client.SocketServerInstanceFactory.createServerInstance(SocketServerInstanceFactory.java:61)
       at com.metamatrix.common.comm.platform.socket.client.SocketServerInstancePool.createServerInstance(SocketServerInstancePool.java:507)
       at com.metamatrix.common.comm.platform.socket.client.SocketServerInstancePool.findServerInstance(SocketServerInstancePool.java:455)
       at com.metamatrix.common.comm.platform.socket.client.SocketServerInstancePool.getServerInstance(SocketServerInstancePool.java:320)
       at com.metamatrix.common.comm.platform.socket.client.SocketServerConnection.selectServerInstance(SocketServerConnection.java:379)
       at com.metamatrix.common.comm.platform.socket.client.SocketServerConnection.connect(SocketServerConnection.java:261)
       at com.metamatrix.common.comm.platform.socket.client.SocketServerConnectionFactory.establishConnection(SocketServerConnectionFactory.java:115)
       at com.metamatrix.jdbc.transport.SocketTransportHandler.createConnection(SocketTransportHandler.java:45)
       at com.metamatrix.jdbc.transport.MultiTransportFactory.establishConnection(MultiTransportFactory.java:55)
       at com.metamatrix.jdbc.MMDriver.createMMConnection(MMDriver.java:152)
       at com.metamatrix.jdbc.MMDriver.connect(MMDriver.java:125)
       at java.sql.DriverManager.getConnection(DriverManager.java:582)
       at java.sql.DriverManager.getConnection(DriverManager.java:207)
       at JDBCQueryExample.run(JDBCQueryExample.java:53)
       at JDBCQueryExample.main(JDBCQueryExample.java:127)