Strange exception opening JDBC connection

Hi,

I am getting a strange exception when opening a JDBC connection.
Specifically it is:

java.net.BindException: Address already in use: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:295)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:161)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:148)
at java.net.Socket.connect(Socket.java:425)
at java.net.Socket.connect(Socket.java:375)
at java.net.Socket.<init>(Socket.java:290)
at java.net.Socket.<init>(Socket.java:118)
at org.postgresql.PG_Stream.<init>(PG_Stream.java:38)
at
org.postgresql.jdbc1.AbstractJdbc1Connection.openConnection(AbstractJdbc1Connection.java:154)
at org.postgresql.Driver.connect(Driver.java:120)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
at java.sql.DriverManager.getConnection(DriverManager.java:171)

Connections prior to this one have worked fine so the server is up and
running, and it seems strange that an address already in use would
happen when a client connection is made. Any ideas what is going on?
Does the JDBC driver try to listen on a port?

Thanks,

Kevin