vCenter Server displays the error message: unable to connect to the host

vCenter Server displays the error message: unable to connect to the host

Symptoms

• vCenter Server cannot connect to a host when you perform operations such as:

o Storage vMotion

o cold migration

o cloning a virtual machine

o the model deployment

• Newspapers vpxd that contains an entry similar to:

[2009-06-04 19:27:16.326 error "App" 4444] [VpxdInvtHost] IP address change for 10.223.122.143 to 10.223.127.197 unhandled, verification of the SSL certificate is not enabled.

• You see errors similar to:

Unable to connect to the host o

o [2009-06-04 19:27:09.952 'Libs' 3902384 WARNING] [NFC ERROR] NfcNewAuthdConnectionEx: unable to connect to peer (numRetries = 2). Error: Unable to connect to the host 10.223.122.143: connection timed out

• vCenter Server shows the VMS as being disconnected then connected.

Hello

Resolution

Cause

This problem can occur if an ESX host's IP address is changed while being managed by vCenter Server.

Check the cause

To check the cause of the problem:

  1. Log in as root to the ESX host using a SSH client.
  1. In the file etc/opt/vmware/vpxa/vpxa.cfg, find the IP address of the host. The entry looks like:


    10.21.48.121

    Note: for more information about editing the files, see installation in VMware ESX configuration files (1017022).

Troubleshooting

If the IP address is incorrect, perform the following steps in order. If the operation does not resolve the problem, continue to the next step. Don't skip a step.

  1. Disconnect and then reconnect the host:
  1. Right click on the ESX host in vCenter Server and click Disconnect.
  1. Reconnect the ESX host in vCenter Server.
  1. Restart the VirtualCenter agent on the ESX host:
  1. Stop the service of vpxa with the command:

    # service vmware-vpxa stop

  1. Open the /etc/opt/vmware/vpxa/vpxa.cfg file in a text editor and correct the IP address of the ESX host.
  1. Start the service of vpxa with the command:

    # service vmware-vpxa start

    Note: for VMware ESXi, you may have to restart all the management agents. For more information, see restart the agents on an ESX or ESXi Server (1003490) management .

  1. Rebuild the VirtualCenter agent on the ESX host configuration file:

    Attention: this step removes all the Statistics counters historical host and the virtual machine. If VMware ESX host is running in virtual machines that starts in a permitted CVS environment, you maybe won't be able to add the host without stopping the virtual machines first.

  1. Right click on the ESX host in vCenter Server and click Disconnect.
  1. Remove the ESX host disconnected from vCenter Server.
  1. Backup the file vpxa.cfg with the command:

    # mv /etc/opt/vmware/vpxa/vpxa.cfg /etc/opt/vmware/vpxa/vpxa.oldcfg

  1. Add the ESX host disconnected to the server vCenter inventory.
  1. Run the following command to view the contents of /etc/opt/vmware/vpxa/vpxa.cfg and confirm that the host IP address is correct:

    # cat /etc/opt/vmware/vpxa/vpxa.cfg

Tags: VMware

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