не отвечает esx 5.1. host

Добрые день, коллеги.

Имеется такая проблема: периодически пропадает сеть на хосте ESX 5.1. Т.е. хост не пингается, не пингаются вирт. машины, сам хот тоже ничего не пингает. После перезагрузки проблемы решается.

В системных логах не нашел ничего подозрительного.. Может плохо искал? Где смотреть ?

Вот часть лога

2013-07-02T04:35:02Z syslog[2887065]: starting hostd probing.

2013-07-02T04:35:17Z syslog[2887065]: hostd probing is done.

2013-07-02T04:40:01Z crond[4601]: crond: USER root pid 2879087 cmd /sbin/hostd-probe

2013-07-02T04:40:02Z syslog[2883184]: starting hostd probing.

2013-07-02T04:40:17Z syslog[2883184]: hostd probing is done.

2013-07-02T04:45:01Z crond[4601]: crond: USER root pid 2887508 cmd /sbin/hostd-probe

2013-07-02T04:45:02Z syslog[2887509]: starting hostd probing.

2013-07-02T04:45:17Z syslog[2887509]: hostd probing is done.

2013-07-02T04:47:58Z DCUI: pam_per_user: create_subrequest_handle(): doing map lookup for user "root"

2013-07-02T04:47:58Z DCUI: pam_per_user: create_subrequest_handle(): creating new subrequest (user="root", service="system-auth-generic")

2013-07-02T04:47:58Z DCUI: Authentication of user root succeeded

2013-07-02T04:47:58Z DCUI: User root logged in

2013-07-02T04:47:58Z DCUI: pam_per_user: create_subrequest_handle(): doing map lookup for user "root"

2013-07-02T04:47:58Z DCUI: pam_per_user: create_subrequest_handle(): creating new subrequest (user="root", service="system-auth-generic")

2013-07-02T04:47:58Z DCUI: pam_unix(system-auth-generic:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost= user=root

2013-07-02T04:48:00Z DCUI: COLS=128, LINES=48

2013-07-02T04:48:01Z DCUI: GetManagementInterface: Tagging vmk0 as Management

2013-07-02T04:48:01Z DCUI: SetTaggedManagementInterface: Writing vmk0 to the ManagementIface node

2013-07-02T04:48:01Z DCUI: NotifyDCUI: Notifying the DCUI of configuration change

2013-07-02T04:48:01Z DCUI: NotifyDCUI: Skipping DCUI notify, since we are in DCUI

2013-07-02T04:48:01Z DCUI: GetManagementInterface: Tagging vmk0 as Management

2013-07-02T04:48:01Z DCUI: SetTaggedManagementInterface: Writing vmk0 to the ManagementIface node

2013-07-02T04:48:03Z DCUI: GetManagementInterface: Tagging vmk0 as Management

2013-07-02T04:48:03Z DCUI: SetTaggedManagementInterface: Writing vmk0 to the ManagementIface node

2013-07-02T04:48:03Z DCUI: NotifyDCUI: Notifying the DCUI of configuration change

2013-07-02T04:48:03Z DCUI: NotifyDCUI: Skipping DCUI notify, since we are in DCUI

2013-07-02T04:48:03Z DCUI: GetManagementInterface: Tagging vmk0 as Management

2013-07-02T04:48:03Z DCUI: SetTaggedManagementInterface: Writing vmk0 to the ManagementIface node

2013-07-02T04:48:07Z DCUI: GetManagementInterface: Tagging vmk0 as Management

2013-07-02T04:48:07Z DCUI: SetTaggedManagementInterface: Writing vmk0 to the ManagementIface node

2013-07-02T04:48:27Z DCUI: GetManagementInterface: Tagging vmk0 as Management

2013-07-02T04:48:27Z DCUI: SetTaggedManagementInterface: Writing vmk0 to the ManagementIface node

2013-07-02T04:48:27Z DCUI: NotifyDCUI: Notifying the DCUI of configuration change

2013-07-02T04:48:27Z DCUI: NotifyDCUI: Skipping DCUI notify, since we are in DCUI