Yes, the issue is from SELinux. thank everybody for help
> donghe@caltech.edu writes:
>>>> You do have a point on the "Permission denied", though. If the
>>>> problem was where I was suggesting, it would probably say "Connection
>>>> refused". Perhaps some OS security restriction is in play here.
>
>>> SELinux? I've never used it personally but have heard it can throw
>>> some
>>> errors you don't normally expect.
>
>> i use fedora 11
>
> Then it's SELinux. If it works after "setenforce permissive", it's
> definitely selinux. File a bug against selinux-policy.
>
> regards, tom lane
>
