Thanks for hints! In case of anyone having similar problem - it can be easily solved. Windows 2003 Server deserves painful death! It just stopped answering pings and most of the network traffic was terribly slow (MS SQL Server worked, though... strange). Restarting the Windows server helped - everything works now. We could not do it before (very important users, MS SQL Server, other wonderful things). I suppose the problem was not in any way connected with PostgreSQL. Someone told me that many W2003S configurations (especially with some server services running) require weekly restart to work well. Just in case, PostgreSQL server will be probably moved in some time to Solaris or some *nix... Thanks, Bart Golda