JDBC Connection broken (followup)

Oh, tried this with Windows firewall off, and AV off too. Here's the logging of the last few successful, and then the unsuccessful....

2009-08-17 00:56:58 PDTLOG: 00000: connection received: host=127.0.0.1 port=3233
2009-08-17 00:56:58 PDTLOCATION: BackendInitialize, .\src\backend\postmaster\postmaster.c:3205
2009-08-17 00:56:58 PDTLOG: 00000: connection authorized: user=mjb database=retain
2009-08-17 00:56:58 PDTLOCATION: BackendInitialize, .\src\backend\postmaster\postmaster.c:3283
2009-08-17 00:56:58 PDTLOG: 00000: disconnection: session time: 0:00:00.016 user=mjb database=retain host=127.0.0.1 port=3233
2009-08-17 00:56:58 PDTLOCATION: log_disconnections, .\src\backend\tcop\postgres.c:4024
2009-08-17 00:56:58 PDTLOG: 00000: connection received: host=127.0.0.1 port=3234
2009-08-17 00:56:58 PDTLOCATION: BackendInitialize, .\src\backend\postmaster\postmaster.c:3205
2009-08-17 00:56:58 PDTLOG: 00000: connection authorized: user=mjb database=retain
2009-08-17 00:56:58 PDTLOCATION: BackendInitialize, .\src\backend\postmaster\postmaster.c:3283
2009-08-17 00:56:58 PDTLOG: 00000: disconnection: session time: 0:00:00.000 user=mjb database=retain host=127.0.0.1 port=3234
2009-08-17 00:56:58 PDTLOCATION: log_disconnections, .\src\backend\tcop\postgres.c:4024
2009-08-17 00:56:58 PDTLOG: 00000: connection received: host=127.0.0.1 port=3235
2009-08-17 00:56:58 PDTLOCATION: BackendInitialize, .\src\backend\postmaster\postmaster.c:3205
2009-08-17 00:56:58 PDTLOG: XX000: could not receive data from client: An operation was attempted on something that is not a socket.
2009-08-17 00:56:58 PDTLOCATION: pq_recvbuf, .\src\backend\libpq\pqcomm.c:769
2009-08-17 00:56:59 PDTLOG: 08P01: incomplete startup packet
2009-08-17 00:56:59 PDTLOCATION: ProcessStartupPacket, .\src\backend\postmaster\postmaster.c:1469