HCX Download plug-in Error downloading plug-in. URL is unreachable. No route to host (Host unreachable)

Products

• VMware HCX
• VMware Cloud on AWS

Issue/Introduction

In the vCenter task list, this error continues to appear, as shown below, even though HCX is not deployed in the environment.

Download plug-in
Error downloading plug-in. URL is unreachable.
No route to host (Host unreachable)

• On the vCenter server, under /var/log/vmware/vsphere-ui/logs/vsphere_client_virgo.log, we can see the errors similar as shown below

[ERROR] sdk-plugin-deployer-## com.vmware.vise.plugin.status.RemotePluginStatusServiceImpl DOWNLOAD_FAILED: Error downloading plugin package com.vmware.vsphere.update.manager.client:#.#.#.# from https://<vCenter-server-fqdn>:443/vci/downloads/vum-ui/plugin.zip. Reason: URL is unreachable. Make sure that the URL is reachable. com.vmware.vise.plugin.download.PluginDownloadException: org.apache.http.client.HttpResponseException: status code: 503, reason phrase: Service Unavailable

Note: This behavior is not specific to HCX 4.9.2 and may occur across different HCX versions.

Environment

HCX
VMC on AWS

Cause

vCenter is attempting to download or refresh a registered plug-in, but the configured plug-in URL is not reachable as its not deployed in the environment.

Resolution

Remove the unwanted HCX plugin from VMware vCenter Server. For more information, please refer to the following KB: 317510: Option 1 or 2