boot up error on /var/log/messages [server.ERROR] cannot start systen DBus service
 

On boot system (CentOS 5.2) I allways have this error in my /var/log/messages:
'myshostname ' setroubleshoot: [server.ERROR] cannot start systen DBus service: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory


/var/run/dbus/system_bus_socket file is exist on the system and has this permissions:
srwxrwxrwx 1 root root 0 Aug 4 11:50 system_bus_socket
Trying to cat or less you get this:
cat system_bus_socket
cat: system_bus_socket: No such device or address
[root@host dbus]# less -f system_bus_socket
system_bus_socket: No such device or address
what could be cousing this problem?

Linux host.com 2.6.18-128.2.1.el5 #1 SMP Tue Jul 14 06:39:56 EDT 2009 i686 i686 i386 GNU/Linux