[Dovecot] auth-worker.18163) failed: Permission denied

[Xueron Nee]

Hi,

    I use a non-root user to run auth program and get an error:
auth-worker.18163) failed: Permission denied and cannot start dovecot.
But with the same configration at another server, it works fine. If I
use root, it works also.
    
    Any help?

Version: 1.1.1
Error log:
dovecot: Jul 02 15:46:47 Fatal: auth(default): net_connect_unix(/home/xueron/var/run/dovecot/auth-worker.18163) failed: Permission denied
dovecot: Jul 02 15:46:47 Fatal: Auth process died too early - shutting down

Then I check the /home/xueron/var/run/dovecot/:
srw-rw-rw- 1 amos     amos        0 Jul  2 15:46 auth-master
srw------- 1 amosauth amosauth    0 Jul  2 15:46 auth-worker.18163
srw------- 1 amosauth amosauth    0 Jul  2 15:46 auth-worker.18164
srw------- 1 amosauth amosauth    0 Jul  2 15:46 auth-worker.18165
srwxrwxrwx 1 root     root        0 Jul  2 15:46 dict-server
drwxr-x--- 2 root     amosdove 4096 Jul  2 15:46 login
-rw------- 1 root     root       43 Jul  2 15:46 master-fatal.lastlog
-rw------- 1 root     root        6 Jul  2 15:46 master.pid

the owner has already changed to the user i set in dovecot.conf

Thanks!

--
Xueron Nee
http://www.xueron.com