Error connecting with PGADMIN II

Hello all,
i'm using PostgreSQL 7.2.1 on Mandrake 8.2 on one host server.
From one PC client with windows XP home edition with last version of
PGADMIN II and ODBC driver i try to connect to server but i can't.
The error that i received was:

05/05/2002 15.26.18 - Error in pgAdmin
II:frmConnect.cmdConnect_Click: -2147217842 - Operazione annullata.

On the server, postgresql was configured to accept connection via TCP-
IP from all the subnet on the port 5432.
I have one database superuser foo (user that was created after initdb
with usercreted and databasecreated permissions)
and one database foodb created by foo. From the same client where
PGADMIN have problem, i import and see the tables
of database by MS Access XP and the same ODBC driver. With "connection
debugging tools plugin" i try too and go well.
So i think that the problem is in pgadmin.

Someone can help me?

Many thanks
Stefano Flaim