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Cannot connect to the remote server when downloading the vCenter Update Manager or Converter plugins (1004887)

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  • Cannot connect to the remote server
  • Downloading and installing the vCenter Update Manager plugin, reports these message:

    • Unable to connect to the remote server
    • Error connecting to the VMware vCenter Update manager
      Cannot communicate with the remote host, either due to network errors or because the host is not responding

  • The vCenter Update Manager logs ( C:\Documents and Settings\All Users\Application Data\VMware\Update Manager or C:\Users\All Users\VMware\VMware Update Manager\Logs\vmware-vum-server-log4cpp.log) contain entries similar to:

    error Failed to establish Vim connection to
    http://<IP address of VC>:80/. Vmacore::Exception: No connection could be made because the target machine actively refused it.

  • Downloading and installing the vCenter Converter plugin reports the error:

    Unable to connect to the remote server


Ensure that you have network connectivity between the vSphere Client, ESX/ESXi, vCenter Server, and vCenter Update Manager/Converter systems.
To ensure network connectivity:
  1. Verify that no firewalls are preventing communications between the systems. Consult your vendor. For more information, see Required ports for configuring an external firewall to allow ESX/ESXi and vCenter Server traffic (1005189).
  2. Verify that there are no name resolution (DNS) issues. In order to troubleshoot this issue see Identifying issues with and setting up name resolution on ESX/ESXi Server (1003735).

    Note: This includes DNS resolution across domains.

  3. Verify that the clients are accessible via web browser at:

    • vCenter Server 2.5.x - http://IP_address/vci/downloads/VMware-UMClient.exe
    • vCenter Server 2.5.x and 4.x - http://IP_address/vmc/VMware%20Converter%20Client.exe
    • vCenter Server 4.x and above - http://IP address:9084/vci/downloads/VMware-UMClient.exe

  4. If you have changed the IP address of vCenter Server with which your Update Manager system works, see Reconfiguring vCenter Update Manager after changing the vCenter Server IP address (1014639).
  5. Manually install the clients and verify that the vCenter Update Manager server is accessible and that the vCenter Converter is functional.

    • In thevSphere Client, click Plugins.
    • Click Manage Plugins. The Plugin Manager dialog opens.
    • Click the Available tab.
    • Select the download to install.

  6. If all the previous steps are verified, vCenter Server may have lost the registration for the vCenter Update Manager and the vCenter Converter servers. Perform a Repair/Install for both vCenter Update Manager and vCenter Converter.

Additional Information


vcenter-plugins-fail converter-plugin-issue converter-plugin-fails update-manager-plugin-fails

See Also

Update History

01/07/2011 - Added vCenter Server 4.x to Products 06/27/2011 - Added additional error in Symptoms and corresponding resolution 08/15/2012 - Updated for 5.0 03/27/2014 - Updated for VMware vSphere Update Manager 5.1.x and VMware vSphere Update Manager 5.5.x

Request a Product Feature

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.


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  • 35 Ratings