I started postgresql with command: /etc/init.d/postgresql start I created user 'trantu' with password 'hanoi' and this user have privileges fully to create database and create user. when I type a command: psql -U trantu -p hanoi or psql -U trantu -p hanoi waterdb have a same error: psql: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGSQL.0"? With phpPgAdmin, apache and php are configured perfecly. Please help me to debug it. Thank you very much. ******************************************************* Tran Anh Tu Vien CNTT - DHQG Ha Noi Phone: 047680417-25 Email trantu@xxxxxxxxxx *******************************************************