Winsock error 10035 while trying to upgrade from 8.0 to 8.2

I'm trying to upgrade a pretty big database (60G) from postgres 8.0 to
postgres 8.2 on windows 2000 Server (both version running on the same machine
on different ports). During the migration process, I always get an error at
some point (never the same) :

LOG: could not receive data from client: Unknown winsock error 10035

which is followed by

LOG: incomplete message from client
ERROR: unexpected EOF on a client connexion
FATAL: invalid frontend message type 53 psql -U postgres -p 5433

Moving the 8.2 postgres instance to a winxp pro machine, the migration is
successfull.

I've searched google but didn't find anything related to postgres.

cyril

Source database : postgres 8.0.9
Destination database : postgres 8.2.4
OS : Windows 2000 Server SP4
migration is done on linux using 8.2.4 binaries (since piping pg_dump output
on windows stop on the first ctrl-Z) with "pg_dump -h YYY XXX | psql -h YYY -p
5433 XXX"