Strange. I can logon with an invalid or no password atall

My program is reporting "Logged on." even if I enter an invalid or no
password atall.
Here is my login function and below is the function that calls it:

bool DBConn::Connect(const std::string &host, const std::string
&user,
const std::string &pass)
// Connects to the database
{
std::string cs = "hostaddr = '" + host +
"' port = '' dbname = 'TBDB' user = '" + user +
"' password = '" + pass + "' connect_timeout = '10'";
pg_conn = PQconnectdb(cs.c_str());
if (!pg_conn)
return false;
if (PQstatus(pg_conn) != CONNECTION_OK)
return false;
return true;
}

void TBClientFrame::Login(const wxString &user, const wxString &pass)
{
std::string host("127.0.0.1");
std::string user_str = std::string(user.mb_str(*wxConvCurrent));
std::string pass_str = std::string(pass.mb_str(*wxConvCurrent));
if (db_conn.Connect(host, user_str, pass_str))
wxMessageBox(wxT("Logged on."), wxT("Client Info."));
else
{
fprintf(stderr, "%s", db_conn.ErrorMsg());
}
}

It does report an error if the user name is invalid. What could cause
this strange behaviour.