Can not ping the vm guest in Esxi 5.1

Hi all

    I have a Vcenter version 5.5 and 2 Esxi 5.1 joined, recent I have an issue with one of the Esxi host, this Esxi host and 4 vm guests running, suddenly I couldn't ping any of the vm guest in this Esxi host, but I could ping this Esxi host, but won't be able to connected via vsphere client, in order to have this resolved is to reboot the Esxi host itself, any idea what causes such problem ?

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Can you ping the Host and VMs now ?

can you repeat the issue ?
piaakitAuthor Commented:
I can only ping the Esxi itself but won't be able to connect via vsphere, also can not ping all the vm guests running within this Esxi , I must reboot in order to resume everything normal
piaakitAuthor Commented:
Reboot the Esxi I meant
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Is this a new installation, or has been working ?
piaakitAuthor Commented:
Has been working for few years
piaakitAuthor Commented:
Any idea ?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Many ideas!

please upload screenshots of ESXi networking.
piaakitAuthor Commented:
There you go !

Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
So are ALL your virtual machines and ESXi host on the same network ?
piaakitAuthor Commented:
you are correct
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
if you cannot connect via vSphere Client to - the network management agents have hung, or crashed.

Are you trying to connect directly, or is this via vCenter Server ?

This would still allow you to ping the management interface, on, but something must be affecting the vSwitch.

Can you re-produce the issue ?

I notice you are on the latest version of 5.1, but your ESXi host is not setup correctly, e.g. localhost.localdomain ?

this should have a hostname, and FQDN ?

You also have only a single interface, which is a single point of failure.

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piaakitAuthor Commented:
problem resolved by vmoition the vcenter vm guest to another esxi, thanks for your reply !
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