Error: Cluster contains payload from unsupported solution(s) during vLCM image conversion in vSphere 8.x

Products

• VMware vCenter Server

Issue/Introduction

When attempting to convert a cluster from VUM baselines to vSphere Lifecycle Manager (vLCM) images, the task fails with a generic error.

Symptoms

• The vSphere Client displays the error: Cluster contains payload from unsupported solution(s).
• In vmware-vum-server.log, timeouts are observed: #### error vmware-vum-server[####] [Originator@6876 sub=ImageManager::EnablementManager] [EnablementManager ####] Retrieving installed components for '####' host timed out
• In hostd.log on the affected ESXi host, the following error appears: error vpxa[####] [Originator@6876 sub=HTTP session map] Out of HTTP sessions: Limited to 500

Environment

• VMware vCenter Server 8.x
• VMware ESXi 8.x

Cause

 The ESXi management agent (vpxa) has reached its hard limit of 500 concurrent HTTP sessions. This prevents vCenter Server from successfully polling the host for installed components during the vLCM image check.

Resolution

Restart the management agents on the impacted ESXi host to clear stagnant HTTP sessions.

1. Connect to the ESXi host identified in the logs via SSH.
2. Run the following command to restart the vpxa agent: etc/init.d/vpxa restart
3. If the issue persists, reboot the ESXi host
4. Re-attempt the vLCM cluster image conversion.

Additional Information

Restarting Management Agents in ESXi