have checked logs
Logs do not show anything that helps, just user login failed multiple times?
messages says this:
Aug 28 10:43:13 ip-208-109-222-85 syslogd 1.4.1: restart.ug 28 10:43:13 ip-208-109-222-85 syslogd 1.4.1: restart.
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: starting BIND 9.3.4-P1 -u named
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: found 4 CPUs, using 4 worker threads
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: loading configuration from '/etc/named.conf'
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: no IPv6 interfaces found
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: listening on IPv4 interface lo, 127.0.0.1#53
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: listening on IPv4 interface venet0:0, 208.109.222.85#53
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: listening on IPv4 interface venet0:1, 208.109.222.128#53
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: listening on IPv4 interface venet0:2, 208.109.249.29#53
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: command channel listening on 127.0.0.1#953
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: zone qualitychurchfurniture.com/IN: loaded serial 2007080101
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: zone qualitychurchfurniture.com/IN: sending notifies (serial 2007080101)
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: client 208.109.249.29#53952: received notify for zone 'qualitychurchfurniture.com'
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: running
Aug 28 10:44:15 ip-208-109-222-85 saslauthd[21882]: detach_tty : master pid is: 21882
Aug 28 10:44:15 ip-208-109-222-85 saslauthd[21882]: ipc_init : listening on socket: /var/run/saslauthd/mux
Aug 28 10:44:16 ip-208-109-222-85 avahi-daemon[21898]: Found user 'avahi' (UID 70) and group 'avahi' (GID 70).
Aug 28 10:44:16 ip-208-109-222-85 avahi-daemon[21898]: Successfully dropped root privileges.
Aug 28 10:44:16 ip-208-109-222-85 avahi-daemon[21898]: avahi-daemon 0.6.16 starting up.
Aug 28 10:44:16 ip-208-109-222-85 avahi-daemon[21898]: WARNING: No NSS support for mDNS detected, consider installing nss-mdns!
Aug 28 10:44:16 ip-208-109-222-85 avahi-daemon[21898]: dbus_bus_get(): Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
Aug 28 10:44:16 ip-208-109-222-85 avahi-daemon[21898]: WARNING: Failed to contact D-Bus daemon.
Aug 28 10:44:17 ip-208-109-222-85 portsentry[21958]: adminalert: Psionic PortSentry 1.1 is starting.
Aug 28 10:44:17 ip-208-109-222-85 portsentry[21960]: adminalert: Going into listen mode on TCP port: 1
Aug 28 10:44:17 ip-208-109-222-85 portsentry[21960]: adminalert: Going into listen mode on TCP port: 111
Aug 28 10:44:17 ip-208-109-222-85 portsentry[21960]: adminalert: PortSentry is now active and listening.
Aug 28 10:44:17 ip-208-109-222-85 portsentry[21961]: adminalert: Psionic PortSentry 1.1 is starting.
Aug 28 10:44:17 ip-208-109-222-85 portsentry[21963]: adminalert: ERROR: No UDP ports supplied in config file. Aborting
Aug 28 10:44:17 ip-208-109-222-85 portsentry[21963]: adminalert: ERROR: could not go into PortSentry mode. Shutting down.
Aug 28 10:44:17 ip-208-109-222-85 portsentry[21963]: securityalert: Psionic PortSentry is shutting down
Aug 28 10:44:17 ip-208-109-222-85 portsentry[21963]: adminalert: Psionic PortSentry is shutting down
Aug 28 10:44:17 ip-208-109-222-85 init: no more processes left in this runlevel
Aug 28 11:33:48 ip-208-109-222-85 named[18371]: unexpected RCODE (SERVFAIL) resolving 'cpan.cs.pu.edu.tw/A/IN': 140.128.9.2#53
Aug 28 11:33:58 ip-208-109-222-85 named[18371]: lame server resolving 'mailadmin.nortex.net' (in 'nortex.NET'?): 69.7.80.10#53
Aug 28 11:34:02 ip-208-109-222-85 named[18371]: unexpected RCODE (SERVFAIL) resolving 'cpan.gazi.edu.tr/A/IN': 194.27.18.20#53
Aug 28 11:34:03 ip-208-109-222-85 named[18371]: unexpected RCODE (REFUSED) resolving 'glkd.gazi.edu.tr/A/IN': 193.140.83.251#
Aug 28 10:43:14 ip-208-109-222-85 named[18371]: starting BIND 9.3.4-P1 -u named