Win Client & PostgreSQL FreeBSD

Hoi!
With following Source i try to connect a PostgreSQL Database running on
FreeBSD:
=========================
PGconn *conn;
conn = PQsetdbLogin("192.168.1.34", "5432", NULL, NULL,
"mainhm","mike","****");  
CString err;
if (PQstatus(conn) == CONNECTION_BAD) {
err.Format("Es ist ein Fehler aufgetretenn%s", PQerrorMessage(conn));
AfxMessageBox(err, MB_ICONSTOP | MB_OK);
TRACE("%s", err);
PQfinish(conn);
}
=========================
Following error is displayed in the Debug Window:
connectDBStart() -- connect() failed Is the postmaster running (with -i) at
'192.168.1.34' and accepting connections on TCP/IP port 5432?

=========================
PGconn *conn;
conn = PQconnectdb("hostaddr='192.168.1.34' port='5432'");
=========================
Followings errors are displayed:
Postmaster: Unexpected EOF of client connection
Client: fe_sendauth: authentication type 5 not supported

Postmaster is running with -i option and i can connect with the pgadmin II
without any problems :/
I have Visual C++ SP 5 and  Win2000 SP2

What have i done wrong?
thx & cya mike
Sorry for my bad English :) 

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