Hi...
My DNS Server (BIND) now down.
i try to restart dns with plesk. When i try to restart give this error
;
-------------------------------------
Unable to make action: Unable to manage service by dnsmng: dnsmng:
Service named failed to start

0: /usr/local/psa/admin/htdocs/server/restart_services.php:19
psaerror(string "Unable to make action: Unable to manage service by
dnsmng: dnsmng: Service named failed to start")
---------------------------------------
NOTE: I assume this problem come with plesk 7.5.3 update. Now my web
sites are down.
Please help me...

Try this to see what the problem is:

1) service named restart
2) tail /var/log/messages (to see any errors that come up).

Sorry..but going to need a little more information to be able to help you out here.

this is log when ı type start command...
named[6710]: starting BIND 9.2.3 -u named
named[6710]: using 2 CPUs
named[6712]: loading configuration from '/etc/$
named[6712]: listening on IPv4 interface lo, 1$
named[6712]: listening on IPv4 interface eth0,$
named[6712]: listening on IPv4 interface eth1,$
named[6712]: listening on IPv4 interface eth0,$
named[6712]: listening on IPv4 interface eth1,$
named[6712]: could not configure root hints fr$
named[6712]: loading configuration: file not f$
named[6712]: exiting (due to fatal error)
named[6746]: starting BIND 9.2.3 -u named
named[6746]: using 2 CPUs
named[6748]: loading configuration from '/etc/$
named[6748]: listening on IPv4 interface lo, 1$
named[6748]: listening on IPv4 interface eth0,$
named[6748]: listening on IPv4 interface eth1,$
named[6748]: could not configure root hints fr$
named[6748]: loading configuration: file not f$
named[6748]: exiting (due to fatal error)

I am going to have to say you have a problem in /etc/named.conf file...

Here is what a "normal" startup should look like:

May 20 12:46:18 host named[28563]: starting BIND 9.2.1 -u named -c /etc/named.conf -u named -t /var/named/run-root
May 20 12:46:18 host named[28563]: using 1 CPU
May 20 12:46:18 host named[28563]: loading configuration from '/etc/named.conf'
May 20 12:46:18 host named[28563]: listening on IPv4 interface lo, 127.0.0.1#53
May 20 12:46:18 host named[28563]: listening on IPv4 interface eth0, 123.123.123.123#53

May 20 12:46:18 host named[28563]: command channel listening on 127.0.0.1#953
May 20 12:46:18 host named[28563]: zone 0.0.127.IN-ADDR.ARPA/IN: loaded serial 20010622
May 20 12:46:18 host named[28563]: zone 249.40.216.in-addr.arpa/IN: loaded serial 1113787582



so, I would suggest taking a hard look at your /etc/named.conf file..

Also try to restart from the shell by logging in as root and typing
service named restart

Sometimes restart fails in plesk but works in shell.