phpPgAdmin-4.1.3 login fail

I just installed phpPgAdmin-4.1.3, when I try to
login, it always tell me login fail.

I followed the steps in FAQ but still can't login.

I'm sure that postgresql is running and accepting
tcpip connection (psql -h 192.168.4.4 mydb from other
machine is OK), and password is correct.

I'm using
postgresql-8.2.6
php-4.4.8 (compiled with postgres support)
apache-1.3.39

Any idea??

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