Solved

problem connecting with esx host in vcenter

Posted on 2014-12-19
5
370 Views
Last Modified: 2015-03-07
When I log into vcenter (version 5.0.0), one of my esx hosts is greyed out and shows as disconnected.  The vms on the esx host also show as disconnected, but are still on (I can ping them and rdp into them).  I am able to ping the esx host log into its ilo.  So far, I've tried the following troubleshooting steps:

1) testing the management network from the dcui of the esx host.  Everything passed.

2) restarting the management agent from the dcui.  

3) restarting the management agent from ssh by running the following commands
/etc/init.d/hostd restart
/etc/init.d/vpxa restart

When I try to connect to the esx host from the vcenter console, I get an error which says, "Cannot contact the specified host..The host may not be available on the network, a network configuration problem may exist, or the management services on this host may not be responding."
When I try to connect directly to the esx host (via hostname or ip address) from vsphere, I get an error which says, "Vsphere Client could not connect to [hostname].  An unknown connection occurred. (The request failed because of a connection failure)."
0
Comment
Question by:akyuen
5 Comments
 
LVL 119
ID: 40508696
This is an ESXi 5.0 host and vCenter Server 5.0 or greater ?

Looks like you've done everything you can.

Reboot/restart the host.
0
 
LVL 11

Expert Comment

by:Mr Tortur
ID: 40509179
Hi,
is there any firewall rules that could block you between the host and the vcenter, and between the host and your computer?
From what I remember you mainly need 443, 902 and 903 for vsphere client and between host and vcenter, but also other ports need to be open, depending of what you use :
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1012382#VC5x
0
 
LVL 2

Expert Comment

by:Chach DalSanto
ID: 40509249
I'm assuming that this ESX host has been working for some time and now is not?  In addition to the firewall as Mr Tortur suggests, were there any other changes recently in your infrastructure?  Maybe ESX version update, patching, etc?
0
 

Author Comment

by:akyuen
ID: 40510319
Recently one of our NAS devices went down.  I think the sudden loss of a datastore freaked out the ESX hosts or something.  All the ESX hosts were connecting without any problems prior to the issue with the NAS.
0
 
LVL 119

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 40510337
This can cause the "hung" issue you are experiencing.

There were many bugs especially with iSCSI, and loss of LUNs, that would cause the ESXi host to go into a "hung" state, because the ESXi host will continue polling for the LUNs or Datastores, and this polling action, ties up CPU resource, so the host cannot do anything else of respond to management, or agents.

see here for APD

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2004684

I would restart your host, if this has occurred, and time to update ESXi 5.0 to the latest and last builds!
0

Featured Post

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, I am going to show you how to simulate a multi-site Lab environment on a single Hyper-V host. I use this method successfully in my own lab to simulate three fully routed global AD Sites on a Windows 10 Hyper-V host.
This article outlines why you need to choose a backup solution that protects your entire environment – including your VMware ESXi and Microsoft Hyper-V virtualization hosts – not just your virtual machines.
Teach the user how to configure vSphere clusters to support the VMware FT feature Open vSphere Web Client: Verify vSphere HA is enabled: Verify netowrking for vMotion and FT Logging is in place or create it: Turn On FT for a virtual machine: Verify …
Advanced tutorial on how to run the esxtop command to capture a batch file in csv format in order to export the file and use it for performance analysis. He demonstrates how to download the file using a vSphere web client (or vSphere client) and exp…

792 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question